From dba692ca0fb44678fdcc7634d821f04eac2f8042 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Tue, 11 Jul 2023 14:30:52 -0400 Subject: build: Add liburing on Linux --- .github/workflows/codecov.yml | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to '.github/workflows/codecov.yml') diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml index 783cc43..b06ea62 100644 --- a/.github/workflows/codecov.yml +++ b/.github/workflows/codecov.yml @@ -20,7 +20,8 @@ jobs: libattr1-dev \ libcap2-bin \ libcap-dev \ - libonig-dev + libonig-dev \ + liburing-dev - name: Generate coverage run: | -- cgit v1.2.3 From 2d0cd364b63e26d7ede70cc1d6f85bea87850d84 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Thu, 5 Oct 2023 17:29:52 -0400 Subject: ci: Install expect for unbuffer --- .github/workflows/ci.yml | 5 +++++ .github/workflows/codecov.yml | 1 + 2 files changed, 6 insertions(+) (limited to '.github/workflows/codecov.yml') diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e781055..065fcfd 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -16,6 +16,7 @@ jobs: sudo dpkg --add-architecture i386 sudo apt-get update -y sudo apt-get install -y \ + expect \ gcc-multilib \ libgcc-s1:i386 \ acl \ @@ -49,6 +50,10 @@ jobs: steps: - uses: actions/checkout@v3 + - name: Install dependencies + run: | + brew install expect + - name: Run tests run: | make -j$(sysctl -n hw.ncpu) distcheck diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml index b06ea62..073479a 100644 --- a/.github/workflows/codecov.yml +++ b/.github/workflows/codecov.yml @@ -13,6 +13,7 @@ jobs: run: | sudo apt-get update -y sudo apt-get install -y \ + expect \ gcc \ acl \ libacl1-dev \ -- cgit v1.2.3 From 1117564e6f06860b826f0bc9d27e7d26b7e56eee Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Mon, 1 Jan 2024 23:43:47 -0500 Subject: ci: Update action and image versions --- .github/workflows/ci.yml | 12 ++++++------ .github/workflows/codecov.yml | 4 ++-- .github/workflows/codeql.yml | 8 ++++---- 3 files changed, 12 insertions(+), 12 deletions(-) (limited to '.github/workflows/codecov.yml') diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index bc0719e..38194f2 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -6,10 +6,10 @@ jobs: linux: name: Linux - runs-on: ubuntu-latest + runs-on: ubuntu-22.04 steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install dependencies run: | @@ -48,7 +48,7 @@ jobs: runs-on: macos-13 steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install dependencies run: | @@ -64,14 +64,14 @@ jobs: if: ${{ github.repository_owner == 'tavianator' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }} - runs-on: ubuntu-latest + runs-on: ubuntu-22.04 concurrency: spurion steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - - uses: tailscale/github-action@main + - uses: tailscale/github-action@v2 with: oauth-client-id: ${{ secrets.TS_OAUTH_CLIENT_ID }} oauth-secret: ${{ secrets.TS_OAUTH_SECRET }} diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml index 073479a..9c2119b 100644 --- a/.github/workflows/codecov.yml +++ b/.github/workflows/codecov.yml @@ -4,10 +4,10 @@ on: [push] jobs: build: - runs-on: ubuntu-latest + runs-on: ubuntu-22.04 steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install dependencies run: | diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml index 3a2f81f..71073c6 100644 --- a/.github/workflows/codeql.yml +++ b/.github/workflows/codeql.yml @@ -13,7 +13,7 @@ on: jobs: analyze: name: Analyze - runs-on: ubuntu-latest + runs-on: ubuntu-22.04 permissions: actions: read contents: read @@ -24,7 +24,7 @@ jobs: steps: - name: Checkout - uses: actions/checkout@v3 + uses: actions/checkout@v4 - name: Install dependencies run: | @@ -41,7 +41,7 @@ jobs: liburing-dev - name: Initialize CodeQL - uses: github/codeql-action/init@v2 + uses: github/codeql-action/init@v3 with: languages: cpp queries: +security-and-quality @@ -51,6 +51,6 @@ jobs: make -j$(nproc) all - name: Perform CodeQL Analysis - uses: github/codeql-action/analyze@v2 + uses: github/codeql-action/analyze@v3 with: category: "/language:cpp" -- cgit v1.2.3 From 1109843d017e0320f0d18bfc398e27ff25592dfb Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Thu, 4 Apr 2024 15:17:38 -0400 Subject: build: Don't use libattr We only rely on interfaces like listxattr() which are provided by the C library itself. --- .github/workflows/ci.yml | 3 --- .github/workflows/codecov.yml | 1 - .github/workflows/codeql.yml | 1 - GNUmakefile | 7 ------- README.md | 6 +++--- docs/BUILDING.md | 4 +--- 6 files changed, 4 insertions(+), 18 deletions(-) (limited to '.github/workflows/codecov.yml') diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 4c1c89c..8e688fe 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -23,8 +23,6 @@ jobs: libacl1-dev \ libacl1:i386 \ attr \ - libattr1-dev \ - libattr1:i386 \ libcap2-bin \ libcap-dev \ libcap2:i386 \ @@ -34,7 +32,6 @@ jobs: # Ubuntu doesn't let you install the -dev packages for both amd64 and # i386 at once, so we make our own symlinks to fix -m32 -lacl -l... sudo ln -s libacl.so.1 /lib/i386-linux-gnu/libacl.so - sudo ln -s libattr.so.1 /lib/i386-linux-gnu/libattr.so sudo ln -s libcap.so.2 /lib/i386-linux-gnu/libcap.so sudo ln -s libonig.so.5 /lib/i386-linux-gnu/libonig.so # Work around https://github.com/actions/runner-images/issues/9491 diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml index 9c2119b..d1dc351 100644 --- a/.github/workflows/codecov.yml +++ b/.github/workflows/codecov.yml @@ -18,7 +18,6 @@ jobs: acl \ libacl1-dev \ attr \ - libattr1-dev \ libcap2-bin \ libcap-dev \ libonig-dev \ diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml index 71073c6..c50b266 100644 --- a/.github/workflows/codeql.yml +++ b/.github/workflows/codeql.yml @@ -34,7 +34,6 @@ jobs: acl \ libacl1-dev \ attr \ - libattr1-dev \ libcap2-bin \ libcap-dev \ libonig-dev \ diff --git a/GNUmakefile b/GNUmakefile index 080fb17..8685ca3 100644 --- a/GNUmakefile +++ b/GNUmakefile @@ -125,7 +125,6 @@ endif # USE_ONIGURUMA ifeq ($(OS),Linux) ifndef NOLIBS USE_ACL := y -USE_ATTR := y USE_LIBCAP := y USE_LIBURING := y endif @@ -136,12 +135,6 @@ else LOCAL_CPPFLAGS += -DBFS_USE_SYS_ACL_H=0 endif -ifdef USE_ATTR -LOCAL_LDLIBS += -lattr -else -LOCAL_CPPFLAGS += -DBFS_USE_SYS_XATTR_H=0 -endif - ifdef USE_LIBCAP LOCAL_LDLIBS += -lcap else diff --git a/README.md b/README.md index 9992938..17226fd 100644 --- a/README.md +++ b/README.md @@ -293,7 +293,7 @@ Here's how to install them on some common platforms: 
 Alpine Linux
-# apk add acl{,-dev} attr{,-dev} libcap{,-dev} liburing-dev oniguruma-dev
+# apk add acl{,-dev} attr libcap{,-dev} liburing-dev oniguruma-dev
 
 Arch Linux
 # pacman -S acl attr libcap liburing oniguruma
@@ -302,13 +302,13 @@ Here's how to install them on some common platforms:
 # apt install acl libacl1-dev attr libattr1-dev libcap2-bin libcap-dev liburing-dev libonig-dev
 
 Fedora
-# dnf install acl libacl-devel libattr-devel libcap-devel liburing-devel oniguruma-devel
+# dnf install acl libacl-devel attr libcap-devel liburing-devel oniguruma-devel
 
 NixOS
 # nix-env -i acl attr libcap liburing oniguruma
 
 Void Linux
-# xbps-install -S acl-{devel,progs} attr-{devel,progs} libcap-{devel,progs} liburing-devel oniguruma-devel
+# xbps-install -S acl-{devel,progs} attr-progs libcap-{devel,progs} liburing-devel oniguruma-devel
 
 Homebrew
 $ brew install oniguruma
diff --git a/docs/BUILDING.md b/docs/BUILDING.md
index 02f9756..7eb3a37 100644
--- a/docs/BUILDING.md
+++ b/docs/BUILDING.md
@@ -56,7 +56,7 @@ Here are some of the common ones; check the [`GNUmakefile`](/GNUmakefile) for mo
 | `CC`                             | The C compiler to use, e.g. `make CC=clang` |
 | `CFLAGS`
`EXTRA_CFLAGS`       | Override/add to the default compiler flags  |
 | `LDFLAGS`
`EXTRA_LDFLAGS`     | Override/add to the linker flags            |
-| `USE_ACL`
`USE_ATTR`
...   | Enable/disable [optional dependencies]      |
+| `USE_ACL`
`USE_LIBCAP`
... | Enable/disable [optional dependencies]      |
 | `TEST_FLAGS`                     | `tests.sh` flags for `make check`           |
 | `BUILDDIR`                       | The build output directory (default: `.`)   |
 | `DESTDIR`                        | The root directory for `make install`       |
@@ -73,13 +73,11 @@ These dependencies are optional, and can be turned off at build time if necessar
 | Dependency  | Platforms  | `make` flag     |
 |-------------|------------|-----------------|
 | [acl]       | Linux only | `USE_ACL`       |
-| [attr]      | Linux only | `USE_ATTR`      |
 | [libcap]    | Linux only | `USE_LIBCAP`    |
 | [liburing]  | Linux only | `USE_LIBURING`  |
 | [Oniguruma] | All        | `USE_ONIGURUMA` |
 
 [acl]: https://savannah.nongnu.org/projects/acl
-[attr]: https://savannah.nongnu.org/projects/attr
 [libcap]: https://sites.google.com/site/fullycapable/
 [liburing]: https://github.com/axboe/liburing
 [Oniguruma]: https://github.com/kkos/oniguruma
-- 
cgit v1.2.3


From c31577d102d87455f3f12086be4c0e2159fa5d35 Mon Sep 17 00:00:00 2001
From: Tavian Barnes 
Date: Mon, 8 Apr 2024 11:27:11 -0400
Subject: build: Add a separate configuration step

---
 .github/workflows/ci.yml      |  23 +-
 .github/workflows/codecov.yml |   3 +-
 .github/workflows/codeql.yml  |   1 +
 .gitignore                    |   2 +
 GNUmakefile                   | 372 ------------------------------
 Makefile                      | 517 ++++++++++++++++++++++++++++++++++++++++++
 README.md                     |   4 +-
 config/cc.sh                  |  12 +
 config/empty.c                |   6 +
 config/libacl.c               |   6 +
 config/libcap.c               |   6 +
 config/liburing.c             |   6 +
 config/oniguruma.c            |   6 +
 config/pkg.sh                 |  44 ++++
 config/pkgconf.sh             |  64 ++++++
 docs/BUILDING.md              |  83 +++----
 docs/USAGE.md                 |   2 +-
 src/config.h                  |  11 +-
 src/main.c                    |   1 +
 src/parse.c                   |   2 +-
 src/version.c                 |   6 +
 tests/run.sh                  |   2 +-
 tests/tests.mk                |  10 +-
 23 files changed, 757 insertions(+), 432 deletions(-)
 delete mode 100644 GNUmakefile
 create mode 100644 Makefile
 create mode 100755 config/cc.sh
 create mode 100644 config/empty.c
 create mode 100644 config/libacl.c
 create mode 100644 config/libcap.c
 create mode 100644 config/liburing.c
 create mode 100644 config/oniguruma.c
 create mode 100755 config/pkg.sh
 create mode 100755 config/pkgconf.sh
 create mode 100644 src/version.c

(limited to '.github/workflows/codecov.yml')

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 51d06fb..78aa196 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -53,12 +53,13 @@ jobs:
         run: |
           brew install \
               bash \
-              expect
+              expect \
+              make
 
       - name: Run tests
         run: |
           jobs=$(sysctl -n hw.ncpu)
-          make -j$jobs distcheck
+          gmake -j$jobs distcheck
 
   freebsd:
     name: FreeBSD
@@ -79,8 +80,8 @@ jobs:
             pkg install -y \
                 bash \
                 expect \
-                gmake \
                 oniguruma \
+                pkgconf \
                 sudo \
                 tcl-wrapper
             pw useradd -n action -m -G wheel -s /usr/local/bin/bash
@@ -89,7 +90,7 @@ jobs:
 
           run: |
             chown -R action:action .
-            sudo -u action gmake -j$(nproc) distcheck
+            sudo -u action make -j$(nproc) distcheck
 
   openbsd:
     name: OpenBSD
@@ -119,6 +120,7 @@ jobs:
           run: |
             chown -R action:action .
             jobs=$(sysctl -n hw.ncpu)
+            doas -u action gmake config
             doas -u action gmake -j$jobs check TEST_FLAGS="--sudo=doas --verbose=skipped"
 
   netbsd:
@@ -141,8 +143,8 @@ jobs:
             pkg_add \
                 bash \
                 clang \
-                gmake \
                 oniguruma \
+                pkgconf \
                 sudo \
                 tcl-expect
             useradd -m -G wheel -g =uid action
@@ -152,7 +154,8 @@ jobs:
             PATH="/sbin:/usr/sbin:$PATH"
             chown -R action:action .
             jobs=$(sysctl -n hw.ncpu)
-            sudo -u action gmake -j$jobs check CC=clang LDFLAGS="-rpath /usr/pkg/lib" TEST_FLAGS="--sudo --verbose=skipped"
+            sudo -u action make config CC=clang
+            sudo -u action make -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
 
   dragonflybsd:
     name: DragonFly BSD
@@ -173,8 +176,8 @@ jobs:
             pkg install -y \
                 bash \
                 expect \
-                gmake \
                 oniguruma \
+                pkgconf \
                 sudo \
                 tcl-wrapper
             pw useradd -n action -m -G wheel -s /usr/local/bin/bash
@@ -183,7 +186,8 @@ jobs:
           run: |
             chown -R action:action .
             jobs=$(sysctl -n hw.ncpu)
-            sudo -u action gmake -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
+            sudo -u action make config
+            sudo -u action make -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
 
   omnios:
     name: OmniOS
@@ -215,4 +219,5 @@ jobs:
             PATH="/usr/xpg4/bin:$PATH"
             chown -R action:staff .
             jobs=$(getconf NPROCESSORS_ONLN)
-            sudo -u action gmake -j$jobs check LDFLAGS="-Wl,-rpath,/opt/ooce/lib/amd64" TEST_FLAGS="--sudo --verbose=skipped"
+            sudo -u action gmake config
+            sudo -u action gmake -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index d1dc351..2abe531 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -25,7 +25,8 @@ jobs:
 
       - name: Generate coverage
         run: |
-          make -j$(nproc) gcov check TEST_FLAGS="--sudo"
+          make config GCOV=y
+          make -j$(nproc) check TEST_FLAGS="--sudo"
           gcov -abcfpu obj/*/*.o
 
       - uses: codecov/codecov-action@v3
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index c50b266..a2c224a 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -47,6 +47,7 @@ jobs:
 
       - name: Build
         run: |
+          make config
           make -j$(nproc) all
 
       - name: Perform CodeQL Analysis
diff --git a/.gitignore b/.gitignore
index 4ded7c4..84e47fc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 /bin/
+/gen/
 /obj/
+/distcheck-*/
diff --git a/GNUmakefile b/GNUmakefile
deleted file mode 100644
index 8685ca3..0000000
--- a/GNUmakefile
+++ /dev/null
@@ -1,372 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-ifneq ($(wildcard .git),)
-VERSION := $(shell git describe --always 2>/dev/null)
-endif
-
-ifndef VERSION
-VERSION := 3.1.3
-endif
-
-ifndef OS
-OS := $(shell uname)
-endif
-
-ifndef ARCH
-ARCH := $(shell uname -m)
-endif
-
-CC ?= gcc
-INSTALL ?= install
-MKDIR ?= mkdir -p
-RM ?= rm -f
-
-export BUILDDIR ?= .
-DESTDIR ?=
-PREFIX ?= /usr
-MANDIR ?= $(PREFIX)/share/man
-
-BIN := $(BUILDDIR)/bin
-OBJ := $(BUILDDIR)/obj
-
-DEFAULT_CFLAGS := \
-    -g \
-    -Wall \
-    -Wformat=2 \
-    -Werror=implicit \
-    -Wimplicit-fallthrough \
-    -Wmissing-declarations \
-    -Wshadow \
-    -Wsign-compare \
-    -Wstrict-prototypes
-
-CFLAGS ?= $(DEFAULT_CFLAGS)
-LDFLAGS ?=
-DEPFLAGS ?= -MD -MP -MF $(@:.o=.d)
-
-LOCAL_CPPFLAGS := \
-    -D__EXTENSIONS__ \
-    -D_ATFILE_SOURCE \
-    -D_BSD_SOURCE \
-    -D_DARWIN_C_SOURCE \
-    -D_DEFAULT_SOURCE \
-    -D_GNU_SOURCE \
-    -D_LARGEFILE64_SOURCE \
-    -D_POSIX_PTHREAD_SEMANTICS \
-    -D_FILE_OFFSET_BITS=64 \
-    -D_TIME_BITS=64 \
-    -DBFS_VERSION=\"$(VERSION)\"
-
-LOCAL_CFLAGS := -std=c17 -pthread
-LOCAL_LDFLAGS :=
-LOCAL_LDLIBS :=
-
-ASAN := $(filter asan,$(MAKECMDGOALS))
-LSAN := $(filter lsan,$(MAKECMDGOALS))
-MSAN := $(filter msan,$(MAKECMDGOALS))
-TSAN := $(filter tsan,$(MAKECMDGOALS))
-UBSAN := $(filter ubsan,$(MAKECMDGOALS))
-
-ifdef ASAN
-LOCAL_CFLAGS += -fsanitize=address
-SANITIZE := y
-endif
-
-ifdef LSAN
-LOCAL_CFLAGS += -fsanitize=leak
-SANITIZE := y
-endif
-
-ifdef MSAN
-# msan needs all code instrumented
-NOLIBS := y
-LOCAL_CFLAGS += -fsanitize=memory -fsanitize-memory-track-origins
-SANITIZE := y
-endif
-
-ifdef TSAN
-# tsan needs all code instrumented
-NOLIBS := y
-# https://github.com/google/sanitizers/issues/342
-LOCAL_CPPFLAGS += -DBFS_USE_TARGET_CLONES=0
-LOCAL_CFLAGS += -fsanitize=thread
-SANITIZE := y
-endif
-
-ifdef UBSAN
-LOCAL_CFLAGS += -fsanitize=undefined
-SANITIZE := y
-endif
-
-ifdef SANITIZE
-LOCAL_CFLAGS += -fno-sanitize-recover=all
-endif
-
-ifndef NOLIBS
-USE_ONIGURUMA := y
-endif
-
-ifdef USE_ONIGURUMA
-LOCAL_CPPFLAGS += -DBFS_USE_ONIGURUMA=1
-
-ONIG_CONFIG := $(shell command -v onig-config 2>/dev/null)
-ifdef ONIG_CONFIG
-ONIG_CFLAGS := $(shell $(ONIG_CONFIG) --cflags)
-ONIG_LDLIBS := $(shell $(ONIG_CONFIG) --libs)
-else
-ONIG_LDLIBS := -lonig
-endif
-
-LOCAL_CFLAGS += $(ONIG_CFLAGS)
-LOCAL_LDLIBS += $(ONIG_LDLIBS)
-endif # USE_ONIGURUMA
-
-ifeq ($(OS),Linux)
-ifndef NOLIBS
-USE_ACL := y
-USE_LIBCAP := y
-USE_LIBURING := y
-endif
-
-ifdef USE_ACL
-LOCAL_LDLIBS += -lacl
-else
-LOCAL_CPPFLAGS += -DBFS_USE_SYS_ACL_H=0
-endif
-
-ifdef USE_LIBCAP
-LOCAL_LDLIBS += -lcap
-else
-LOCAL_CPPFLAGS += -DBFS_USE_SYS_CAPABILITY_H=0
-endif
-
-ifdef USE_LIBURING
-LOCAL_CPPFLAGS += -DBFS_USE_LIBURING=1
-LOCAL_LDLIBS += -luring
-endif
-
-LOCAL_LDFLAGS += -Wl,--as-needed
-LOCAL_LDLIBS += -lrt
-endif # Linux
-
-ifeq ($(OS),NetBSD)
-LOCAL_LDLIBS += -lutil
-endif
-
-ifeq ($(OS),DragonFly)
-LOCAL_LDLIBS += -lposix1e
-endif
-
-ifeq ($(OS),SunOS)
-LOCAL_LDLIBS += -lsocket -lnsl
-endif
-
-ifneq ($(filter gcov,$(MAKECMDGOALS)),)
-LOCAL_CFLAGS += --coverage
-# gcov only intercepts fork()/exec() with -std=gnu*
-LOCAL_CFLAGS := $(patsubst -std=c%,-std=gnu%,$(LOCAL_CFLAGS))
-endif
-
-ifneq ($(filter lint,$(MAKECMDGOALS)),)
-LOCAL_CPPFLAGS += \
-    -D_FORTIFY_SOURCE=3 \
-    -DBFS_LINT
-LOCAL_CFLAGS += -Werror -O2
-endif
-
-ifneq ($(filter release,$(MAKECMDGOALS)),)
-LOCAL_CPPFLAGS += -DNDEBUG
-CFLAGS := $(DEFAULT_CFLAGS) -O3 -flto=auto
-endif
-
-ALL_CPPFLAGS = $(LOCAL_CPPFLAGS) $(CPPFLAGS) $(EXTRA_CPPFLAGS)
-ALL_CFLAGS = $(ALL_CPPFLAGS) $(LOCAL_CFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) $(DEPFLAGS)
-ALL_LDFLAGS = $(ALL_CFLAGS) $(LOCAL_LDFLAGS) $(LDFLAGS) $(EXTRA_LDFLAGS)
-ALL_LDLIBS = $(LOCAL_LDLIBS) $(LDLIBS) $(EXTRA_LDLIBS)
-
-# Default make target
-bfs: $(BIN)/bfs
-.PHONY: bfs
-
-# Goals that are treated like flags by this makefile
-FLAG_GOALS := asan lsan msan tsan ubsan gcov lint release
-
-# These are the remaining non-flag goals
-GOALS := $(filter-out $(FLAG_GOALS),$(MAKECMDGOALS))
-
-# Build the default goal if only flag goals are specified
-FLAG_PREREQS :=
-ifndef GOALS
-FLAG_PREREQS += bfs
-endif
-
-# Make sure that "make release" builds everything, but "make release obj/src/main.o" doesn't
-$(FLAG_GOALS): $(FLAG_PREREQS)
-	@:
-.PHONY: $(FLAG_GOALS)
-
-all: bfs tests
-.PHONY: all
-
-$(BIN)/%:
-	@$(MKDIR) $(@D)
-	+$(CC) $(ALL_LDFLAGS) $^ $(ALL_LDLIBS) -o $@
-ifeq ($(OS) $(SANITIZE),FreeBSD y)
-	elfctl -e +noaslr $@
-endif
-
-$(OBJ)/%.o: %.c $(OBJ)/FLAGS
-	@$(MKDIR) $(@D)
-	$(CC) $(ALL_CFLAGS) -c $< -o $@
-
-# Save the full set of flags to rebuild everything when they change
-$(OBJ)/FLAGS.new:
-	@$(MKDIR) $(@D)
-	@echo $(CC) : $(ALL_CFLAGS) : $(ALL_LDFLAGS) : $(ALL_LDLIBS) >$@
-.PHONY: $(OBJ)/FLAGS.new
-
-# Only update obj/FLAGS if obj/FLAGS.new is different
-$(OBJ)/FLAGS: $(OBJ)/FLAGS.new
-	@test -e $@ && cmp -s $@ $< && rm $< || mv $< $@
-
-# All object files except the entry point
-LIBBFS := \
-    $(OBJ)/src/alloc.o \
-    $(OBJ)/src/bar.o \
-    $(OBJ)/src/bfstd.o \
-    $(OBJ)/src/bftw.o \
-    $(OBJ)/src/color.o \
-    $(OBJ)/src/ctx.o \
-    $(OBJ)/src/diag.o \
-    $(OBJ)/src/dir.o \
-    $(OBJ)/src/dstring.o \
-    $(OBJ)/src/eval.o \
-    $(OBJ)/src/exec.o \
-    $(OBJ)/src/expr.o \
-    $(OBJ)/src/fsade.o \
-    $(OBJ)/src/ioq.o \
-    $(OBJ)/src/mtab.o \
-    $(OBJ)/src/opt.o \
-    $(OBJ)/src/parse.o \
-    $(OBJ)/src/printf.o \
-    $(OBJ)/src/pwcache.o \
-    $(OBJ)/src/stat.o \
-    $(OBJ)/src/thread.o \
-    $(OBJ)/src/trie.o \
-    $(OBJ)/src/typo.o \
-    $(OBJ)/src/xregex.o \
-    $(OBJ)/src/xspawn.o \
-    $(OBJ)/src/xtime.o
-
-# The main executable
-$(BIN)/bfs: $(OBJ)/src/main.o $(LIBBFS)
-
-# Testing utilities
-TEST_UTILS := \
-    $(BIN)/tests/mksock \
-    $(BIN)/tests/xspawnee \
-    $(BIN)/tests/xtouch
-
-$(BIN)/tests/mksock: $(OBJ)/tests/mksock.o $(LIBBFS)
-
-$(BIN)/tests/xspawnee: $(OBJ)/tests/xspawnee.o
-
-$(BIN)/tests/xtouch: $(OBJ)/tests/xtouch.o $(LIBBFS)
-
-# All test binaries
-TESTS := $(BIN)/tests/units $(TEST_UTILS)
-
-$(BIN)/tests/units: \
-    $(OBJ)/tests/alloc.o \
-    $(OBJ)/tests/bfstd.o \
-    $(OBJ)/tests/bit.o \
-    $(OBJ)/tests/ioq.o \
-    $(OBJ)/tests/main.o \
-    $(OBJ)/tests/trie.o \
-    $(OBJ)/tests/xspawn.o \
-    $(OBJ)/tests/xtime.o \
-    $(LIBBFS)
-
-# Build all the test binaries
-tests: $(TESTS)
-.PHONY: tests
-
-# Run the unit tests
-unit-tests: $(BIN)/tests/units $(BIN)/tests/xspawnee
-	$<
-.PHONY: unit-tests
-
-# The different flag combinations we check
-INTEGRATIONS := default dfs ids eds j1 j2 j3 s
-INTEGRATION_TESTS := $(INTEGRATIONS:%=check-%)
-
-check-default: $(BIN)/bfs $(TEST_UTILS)
-	+./tests/tests.sh --make="$(MAKE)" --bfs="$<" $(TEST_FLAGS)
-
-check-dfs check-ids check-eds: check-%: $(BIN)/bfs $(TEST_UTILS)
-	+./tests/tests.sh --make="$(MAKE)" --bfs="$< -S $*" $(TEST_FLAGS)
-
-check-j1 check-j2 check-j3 check-s: check-%: $(BIN)/bfs $(TEST_UTILS)
-	+./tests/tests.sh --make="$(MAKE)" --bfs="$< -$*" $(TEST_FLAGS)
-
-# Run the integration tests
-integration-tests: $(INTEGRATION_TESTS)
-.PHONY: integration-tests
-
-# Run all the tests
-check: unit-tests integration-tests
-.PHONY: check
-
-# Custom test flags for distcheck
-DISTCHECK_FLAGS := -s TEST_FLAGS="--sudo --verbose=skipped"
-
-distcheck:
-	+$(MAKE) -B asan ubsan check $(DISTCHECK_FLAGS)
-ifneq ($(OS),Darwin)
-	+$(MAKE) -B msan ubsan check CC=clang $(DISTCHECK_FLAGS)
-endif
-	+$(MAKE) -B tsan ubsan check CC=clang $(DISTCHECK_FLAGS)
-ifeq ($(OS) $(ARCH),Linux x86_64)
-	+$(MAKE) -B check EXTRA_CFLAGS="-m32" ONIG_CONFIG= USE_LIBURING= $(DISTCHECK_FLAGS)
-endif
-	+$(MAKE) -B release check $(DISTCHECK_FLAGS)
-	+$(MAKE) -B check $(DISTCHECK_FLAGS)
-	+$(MAKE) check-install $(DISTCHECK_FLAGS)
-.PHONY: distcheck
-
-clean:
-	$(RM) -r $(BIN) $(OBJ)
-.PHONY: clean
-
-install:
-	$(MKDIR) $(DESTDIR)$(PREFIX)/bin
-	$(INSTALL) -m755 $(BIN)/bfs $(DESTDIR)$(PREFIX)/bin/bfs
-	$(MKDIR) $(DESTDIR)$(MANDIR)/man1
-	$(INSTALL) -m644 docs/bfs.1 $(DESTDIR)$(MANDIR)/man1/bfs.1
-	$(MKDIR) $(DESTDIR)$(PREFIX)/share/bash-completion/completions
-	$(INSTALL) -m644 completions/bfs.bash $(DESTDIR)$(PREFIX)/share/bash-completion/completions/bfs
-	$(MKDIR) $(DESTDIR)$(PREFIX)/share/zsh/site-functions
-	$(INSTALL) -m644 completions/bfs.zsh $(DESTDIR)$(PREFIX)/share/zsh/site-functions/_bfs
-	$(MKDIR) $(DESTDIR)$(PREFIX)/share/fish/vendor_completions.d
-	$(INSTALL) -m644 completions/bfs.fish $(DESTDIR)$(PREFIX)/share/fish/vendor_completions.d/bfs.fish
-.PHONY: install
-
-uninstall:
-	$(RM) $(DESTDIR)$(PREFIX)/share/bash-completion/completions/bfs
-	$(RM) $(DESTDIR)$(PREFIX)/share/zsh/site-functions/_bfs
-	$(RM) $(DESTDIR)$(PREFIX)/share/fish/vendor_completions.d/bfs.fish
-	$(RM) $(DESTDIR)$(MANDIR)/man1/bfs.1
-	$(RM) $(DESTDIR)$(PREFIX)/bin/bfs
-.PHONY: uninstall
-
-check-install:
-	+$(MAKE) install DESTDIR=$(BUILDDIR)/pkg
-	+$(MAKE) uninstall DESTDIR=$(BUILDDIR)/pkg
-	$(BIN)/bfs $(BUILDDIR)/pkg -not -type d -print -exit 1
-	$(RM) -r $(BUILDDIR)/pkg
-.PHONY: check-install
-
-.SUFFIXES:
-
--include $(wildcard $(OBJ)/*/*.d)
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..326ee87
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,517 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# This Makefile implements the configuration and build steps for bfs.  It is
+# portable to both GNU make and the BSD make implementations (how that works
+# is documented below).  To build bfs, run
+#
+#     $ make config
+#     $ make
+
+# The default build target
+default: bfs
+.PHONY: default
+
+# BSD make will chdir into ${.OBJDIR} by default, unless we tell it not to
+.OBJDIR: .
+
+# We don't use any suffix rules
+.SUFFIXES:
+
+# GNU make has $^ for the full list of targets, while BSD make has $> and the
+# long-form ${.ALLSRC}.  We could write $^ $> to get them both, but that would
+# break if one of them implemented support for the other.  So instead, bring
+# BSD's ${.ALLSRC} to GNU.
+.ALLSRC ?= $^
+
+# Platform detection
+OS != uname
+ARCH != uname -m
+
+# For out-of-tree builds, e.g.
+#
+#     $ make config BUILDDIR=/path/to/build/dir
+#     $ make BUILDDIR=/path/to/build/dir
+BUILDDIR ?= .
+
+# Shorthand for build subdirectories
+BIN := ${BUILDDIR}/bin
+GEN := ${BUILDDIR}/gen
+OBJ := ${BUILDDIR}/obj
+
+# GNU make strips a leading ./ from target names, so do the same for BSD make
+BIN := ${BIN:./%=%}
+GEN := ${GEN:./%=%}
+OBJ := ${OBJ:./%=%}
+
+# Installation paths
+DESTDIR ?=
+PREFIX ?= /usr
+MANDIR ?= ${PREFIX}/share/man
+
+# Configurable executables; can be overridden with
+#
+#     $ make config CC=clang
+CC ?= cc
+INSTALL ?= install
+MKDIR ?= mkdir -p
+PKG_CONFIG ?= pkg-config
+RM ?= rm -f
+
+# Configurable flags
+
+CPPFLAGS ?=
+CFLAGS ?= \
+    -g \
+    -Wall \
+    -Wformat=2 \
+    -Werror=implicit \
+    -Wimplicit-fallthrough \
+    -Wmissing-declarations \
+    -Wshadow \
+    -Wsign-compare \
+    -Wstrict-prototypes
+LDFLAGS ?=
+LDLIBS ?=
+
+EXTRA_CPPFLAGS ?=
+EXTRA_CFLAGS ?=
+EXTRA_LDFLAGS ?=
+EXTRA_LDLIBS ?=
+
+GIT_VERSION != test -d .git && command -v git >/dev/null 2>&1 && git describe --always --dirty || echo 3.1.3
+VERSION ?= ${GIT_VERSION}
+
+# Immutable flags
+export BFS_CPPFLAGS= \
+    -D__EXTENSIONS__ \
+    -D_ATFILE_SOURCE \
+    -D_BSD_SOURCE \
+    -D_DARWIN_C_SOURCE \
+    -D_DEFAULT_SOURCE \
+    -D_GNU_SOURCE \
+    -D_LARGEFILE64_SOURCE \
+    -D_POSIX_PTHREAD_SEMANTICS \
+    -D_FILE_OFFSET_BITS=64 \
+    -D_TIME_BITS=64
+export BFS_CFLAGS= -std=c17 -pthread
+
+# Platform-specific system libraries
+LDLIBS,DragonFly := -lposix1e
+LDLIBS,Linux := -lrt
+LDLIBS,NetBSD := -lutil
+LDLIBS,SunOS := -lsocket -lnsl
+_BFS_LDLIBS := ${LDLIBS,${OS}}
+export BFS_LDLIBS=${_BFS_LDLIBS}
+
+# Build profiles
+ASAN ?= n
+LSAN ?= n
+MSAN ?= n
+TSAN ?= n
+UBSAN ?= n
+GCOV ?= n
+LINT ?= n
+RELEASE ?= n
+
+export ASAN_CFLAGS= -fsanitize=address
+export LSAN_CFLAGS= -fsanitize=leak
+export MSAN_CFLAGS= -fsanitize=memory -fsanitize-memory-track-origins
+export UBSAN_CFLAGS= -fsanitize=undefined
+
+# https://github.com/google/sanitizers/issues/342
+export TSAN_CPPFLAGS= -DBFS_USE_TARGET_CLONES=0
+export TSAN_CFLAGS= -fsanitize=thread
+
+SAN := ${ASAN}${LSAN}${MSAN}${TSAN}${UBSAN}
+export SAN_CFLAGS= -fno-sanitize-recover=all
+
+# MSAN and TSAN both need all code to be instrumented
+export NOLIBS= ${MSAN}${TSAN}
+
+# gcov only intercepts fork()/exec() with -std=gnu*
+export GCOV_CFLAGS= --coverage -std=gnu17
+
+export LINT_CPPFLAGS= -D_FORTIFY_SOURCE=3 -DBFS_LINT
+export LINT_CFLAGS= -Werror -O2
+
+export RELEASE_CPPFLAGS= -DNDEBUG
+export RELEASE_CFLAGS= -O3 -flto=auto
+
+# Auto-detected library dependencies.  Can be set manually with
+#
+#     $ make config USE_LIBURING=n USE_ONIGURUMA=y
+USE_LIBACL ?=
+USE_LIBCAP ?=
+USE_LIBURING ?=
+USE_ONIGURUMA ?=
+
+# Save the new value of these variables, before they potentially get overridden
+# by `-include ${CONFIG}` below
+
+_XPREFIX := ${PREFIX}
+_XMANDIR := ${MANDIR}
+
+_XOS := ${OS}
+_XARCH := ${ARCH}
+
+_XCC := ${CC}
+_XINSTALL := ${INSTALL}
+_XMKDIR := ${MKDIR}
+_XRM := ${RM}
+
+_XCPPFLAGS := ${CPPFLAGS}
+_XCFLAGS := ${CFLAGS}
+_XLDFLAGS := ${LDFLAGS}
+_XLDLIBS := ${LDLIBS}
+
+_XUSE_LIBACL := ${USE_LIBACL}
+_XUSE_LIBCAP := ${USE_LIBCAP}
+_XUSE_LIBURING := ${USE_LIBURING}
+_XUSE_ONIGURUMA := ${USE_ONIGURUMA}
+
+# GNU make supports `export VAR`, but BSD make requires `export VAR=value`.
+# Sadly, GNU make gives a recursion error on `export VAR=${VAR}`.
+
+_BUILDDIR := ${BUILDDIR}
+_PKG_CONFIG := ${PKG_CONFIG}
+
+export BUILDDIR=${_BUILDDIR}
+export PKG_CONFIG=${_PKG_CONFIG}
+
+export XPREFIX=${_XPREFIX}
+export XMANDIR=${_XMANDIR}
+
+export XOS=${_XOS}
+export XARCH=${_XARCH}
+
+export XCC=${_XCC}
+export XINSTALL=${_XINSTALL}
+export XMKDIR=${_XMKDIR}
+export XRM=${_XRM}
+
+export XCPPFLAGS=${_XCPPFLAGS}
+export XCFLAGS=${_XCFLAGS}
+export XLDFLAGS=${_XLDFLAGS}
+export XLDLIBS=${_XLDLIBS}
+
+export XUSE_LIBACL=${_XUSE_LIBACL}
+export XUSE_LIBCAP=${_XUSE_LIBCAP}
+export XUSE_LIBURING=${_XUSE_LIBURING}
+export XUSE_ONIGURUMA=${_XUSE_ONIGURUMA}
+
+# The configuration file generated by `make config`
+CONFIG := ${GEN}/config.mk
+-include ${CONFIG}
+
+## Configuration phase (`make config`)
+
+# External dependencies
+PKGS := \
+    ${GEN}/libacl.mk \
+    ${GEN}/libcap.mk \
+    ${GEN}/liburing.mk \
+    ${GEN}/oniguruma.mk
+
+# Makefile fragments generated by `make config`
+MKS := \
+    ${GEN}/vars.mk \
+    ${GEN}/deps.mk \
+    ${GEN}/objs.mk \
+    ${PKGS}
+
+# The configuration goal itself
+config: ${MKS}
+	@printf 'include $${GEN}/%s\n' ${MKS:${GEN}/%=%} >${CONFIG}
+.PHONY: config
+
+# Saves the configurable variables
+${GEN}/vars.mk::
+	@${XMKDIR} ${@D}
+	@printf 'PREFIX := %s\n' "$$XPREFIX" >$@
+	@printf 'MANDIR := %s\n' "$$XMANDIR" >>$@
+	@printf 'OS := %s\n' "$$XOS" >>$@
+	@printf 'ARCH := %s\n' "$$XARCH" >>$@
+	@printf 'CC := %s\n' "$$XCC" >>$@
+	@printf 'INSTALL := %s\n' "$$XINSTALL" >>$@
+	@printf 'MKDIR := %s\n' "$$XMKDIR" >>$@
+	@printf 'RM := %s\n' "$$XRM" >>$@
+	@printf 'CPPFLAGS := %s\n' "$$BFS_CPPFLAGS" >>$@
+	@test "${TSAN}" != y || printf 'CPPFLAGS += %s\n' "$$TSAN_CPPFLAGS" >>$@
+	@test "${LINT}" != y || printf 'CPPFLAGS += %s\n' "$$LINT_CPPFLAGS" >>$@
+	@test "${RELEASE}" != y || printf 'CPPFLAGS += %s\n' "$$RELEASE_CPPFLAGS" >>$@
+	@test -z "$$XCPPFLAGS" || printf 'CPPFLAGS += %s\n' "$$XCPPFLAGS" >>$@
+	@test -z "$$EXTRA_CPPFLAGS" || printf 'CPPFLAGS += %s\n' "$$EXTRA_CPPFLAGS" >>$@
+	@printf 'CFLAGS := %s\n' "$$BFS_CFLAGS" >>$@
+	@test "${ASAN}" != y || printf 'CFLAGS += %s\n' "$$ASAN_CFLAGS" >>$@
+	@test "${LSAN}" != y || printf 'CFLAGS += %s\n' "$$LSAN_CFLAGS" >>$@
+	@test "${MSAN}" != y || printf 'CFLAGS += %s\n' "$$MSAN_CFLAGS" >>$@
+	@test "${TSAN}" != y || printf 'CFLAGS += %s\n' "$$TSAN_CFLAGS" >>$@
+	@test "${UBSAN}" != y || printf 'CFLAGS += %s\n' "$$UBSAN_CFLAGS" >>$@
+	@case "${SAN}" in *y*) printf 'CFLAGS += %s\n' "$$SAN_CFLAGS" >>$@ ;; esac
+	@test "${GCOV}" != y || printf 'CFLAGS += %s\n' "$$GCOV_CFLAGS" >>$@
+	@test "${LINT}" != y || printf 'CFLAGS += %s\n' "$$LINT_CFLAGS" >>$@
+	@test "${RELEASE}" != y || printf 'CFLAGS += %s\n' "$$RELEASE_CFLAGS" >>$@
+	@test -z "$$XCFLAGS" || printf 'CFLAGS += %s\n' "$$XCFLAGS" >>$@
+	@test -z "$$EXTRA_CFLAGS" || printf 'CFLAGS += %s\n' "$$EXTRA_CFLAGS" >>$@
+	@printf 'LDFLAGS := %s\n' "$$XLDFLAGS" >>$@
+	@test -z "$$EXTRA_LDFLAGS" || printf 'LDFLAGS += %s\n' "$$EXTRA_LDFLAGS" >>$@
+	@printf 'LDLIBS := %s\n' "$$XLDLIBS" >>$@
+	@test -z "$$EXTRA_LDLIBS" || printf 'LDLIBS += %s\n' "$$EXTRA_LDLIBS" >>$@
+	@test -z "$$BFS_LDLIBS" || printf 'LDLIBS += %s\n' "$$BFS_LDLIBS" >>$@
+	@case "${OS}-${SAN}" in FreeBSD-*y*) printf 'POSTLINK = elfctl -e +noaslr $$@\n' >>$@ ;; esac
+	@cat $@
+
+# Check for dependency generation support
+${GEN}/deps.mk::
+	@${MKDIR} ${@D}
+	@if config/cc.sh -MD -MP -MF /dev/null config/empty.c; then \
+	    echo 'DEPFLAGS = -MD -MP -MF $${@:.o=.d}'; \
+	fi 2>$@.log | tee $@
+	@printf -- '-include %s\n' ${OBJS:.o=.d} >>$@
+
+# Lists file.o: file.c dependencies
+${GEN}/objs.mk::
+	@${MKDIR} ${@D}
+	@for obj in ${OBJS:${OBJ}/%.o=%}; do printf '$${OBJ}/%s.o: %s.c\n' "$$obj" "$$obj"; done >$@
+
+# Auto-detect dependencies and their build flags
+${PKGS}::
+	@${MKDIR} ${@D}
+	@config/pkg.sh ${@:${GEN}/%.mk=%} >$@ 2>$@.log
+	@cat $@
+
+# bfs used to have flag-like targets (`make release`, `make asan ubsan`, etc.).
+# Direct users to the new configuration system.
+asan lsan msan tsan ubsan gcov lint release::
+	@printf 'error: `make %s` is no longer supported. ' $@ >&2
+	@printf 'Use `make config %s=y` instead.\n' $$(echo $@ | tr '[a-z]' '[A-Z]') >&2
+	@false
+
+## Build phase (`make`)
+
+# The main binary
+bfs: ${BIN}/bfs
+.PHONY: bfs
+
+# All binaries
+BINS := \
+    ${BIN}/bfs \
+    ${BIN}/tests/mksock \
+    ${BIN}/tests/units \
+    ${BIN}/tests/xspawnee \
+    ${BIN}/tests/xtouch
+
+all: ${BINS}
+.PHONY: all
+
+# All object files except the entry point
+LIBBFS := \
+    ${OBJ}/src/alloc.o \
+    ${OBJ}/src/bar.o \
+    ${OBJ}/src/bfstd.o \
+    ${OBJ}/src/bftw.o \
+    ${OBJ}/src/color.o \
+    ${OBJ}/src/ctx.o \
+    ${OBJ}/src/diag.o \
+    ${OBJ}/src/dir.o \
+    ${OBJ}/src/dstring.o \
+    ${OBJ}/src/eval.o \
+    ${OBJ}/src/exec.o \
+    ${OBJ}/src/expr.o \
+    ${OBJ}/src/fsade.o \
+    ${OBJ}/src/ioq.o \
+    ${OBJ}/src/mtab.o \
+    ${OBJ}/src/opt.o \
+    ${OBJ}/src/parse.o \
+    ${OBJ}/src/printf.o \
+    ${OBJ}/src/pwcache.o \
+    ${OBJ}/src/stat.o \
+    ${OBJ}/src/thread.o \
+    ${OBJ}/src/trie.o \
+    ${OBJ}/src/typo.o \
+    ${OBJ}/src/version.o \
+    ${OBJ}/src/xregex.o \
+    ${OBJ}/src/xspawn.o \
+    ${OBJ}/src/xtime.o
+
+# Group relevant flags together
+ALL_CFLAGS = ${CPPFLAGS} ${CFLAGS} ${DEPFLAGS}
+ALL_LDFLAGS = ${CFLAGS} ${LDFLAGS}
+
+# The main binary
+${BIN}/bfs: ${LIBBFS} ${OBJ}/src/main.o
+
+${BINS}:
+	@${MKDIR} ${@D}
+	+${CC} ${ALL_LDFLAGS} ${.ALLSRC} ${LDLIBS} -o $@
+	${POSTLINK}
+
+# All object files
+OBJS := \
+    ${OBJ}/src/main.o \
+    ${OBJ}/tests/alloc.o \
+    ${OBJ}/tests/bfstd.o \
+    ${OBJ}/tests/bit.o \
+    ${OBJ}/tests/ioq.o \
+    ${OBJ}/tests/main.o \
+    ${OBJ}/tests/mksock.o \
+    ${OBJ}/tests/trie.o \
+    ${OBJ}/tests/xspawn.o \
+    ${OBJ}/tests/xspawnee.o \
+    ${OBJ}/tests/xtime.o \
+    ${OBJ}/tests/xtouch.o \
+    ${LIBBFS}
+
+# Depend on ${CONFIG} to make sure `make config` runs first, and to rebuild when
+# the configuration changes
+${OBJS}: ${CONFIG}
+	@${MKDIR} ${@D}
+	${CC} ${ALL_CFLAGS} -c ${@:${OBJ}/%.o=%.c} -o $@
+
+# Save the version number to this file, but only update VERSION if it changes
+${GEN}/NEWVERSION::
+	@${MKDIR} ${@D}
+	@printf '%s\n' '${VERSION}' >$@
+
+${GEN}/VERSION: ${GEN}/NEWVERSION
+	@test -e $@ && cmp -s $@ ${.ALLSRC} && rm ${.ALLSRC} || mv ${.ALLSRC} $@
+
+# Rebuild version.c whenever the version number changes
+${OBJ}/src/version.o: ${GEN}/VERSION
+${OBJ}/src/version.o: CPPFLAGS := ${CPPFLAGS} -DBFS_VERSION='"${VERSION}"'
+
+# Clean all build products
+clean::
+	${RM} -r ${BIN} ${OBJ}
+
+# Clean everything, including generated files
+distclean: clean
+	${RM} -r ${GEN}
+.PHONY: distclean
+
+## Test phase (`make check`)
+
+# Unit test binaries
+UTEST_BINS := \
+    ${BIN}/tests/units \
+    ${BIN}/tests/xspawnee
+
+# Integration test binaries
+ITEST_BINS := \
+    ${BIN}/tests/mksock \
+    ${BIN}/tests/xtouch
+
+# Build (but don't run) test binaries
+tests: ${UTEST_BINS} ${ITEST_BINS}
+.PHONY: tests
+
+# Run all the tests
+check: unit-tests integration-tests
+.PHONY: check
+
+# Run the unit tests
+unit-tests: ${UTEST_BINS}
+	${BIN}/tests/units
+.PHONY: unit-tests
+
+${BIN}/tests/units: \
+    ${OBJ}/tests/alloc.o \
+    ${OBJ}/tests/bfstd.o \
+    ${OBJ}/tests/bit.o \
+    ${OBJ}/tests/ioq.o \
+    ${OBJ}/tests/main.o \
+    ${OBJ}/tests/trie.o \
+    ${OBJ}/tests/xspawn.o \
+    ${OBJ}/tests/xtime.o \
+    ${LIBBFS}
+
+${BIN}/tests/xspawnee: \
+    ${OBJ}/tests/xspawnee.o
+
+# The different flag combinations we check
+INTEGRATIONS := default dfs ids eds j1 j2 j3 s
+INTEGRATION_TESTS := ${INTEGRATIONS:%=check-%}
+
+# Check just `bfs`
+check-default: ${BIN}/bfs ${ITEST_BINS}
+	+./tests/tests.sh --make="${MAKE}" --bfs="${BIN}/bfs" ${TEST_FLAGS}
+
+# Check the different search strategies
+check-dfs check-ids check-eds: ${BIN}/bfs ${ITEST_BINS}
+	+./tests/tests.sh --make="${MAKE}" --bfs="${BIN}/bfs -S ${@:check-%=%}" ${TEST_FLAGS}
+
+# Check various flags
+check-j1 check-j2 check-j3 check-s: ${BIN}/bfs ${ITEST_BINS}
+	+./tests/tests.sh --make="${MAKE}" --bfs="${BIN}/bfs -${@:check-%=%}" ${TEST_FLAGS}
+
+# Run the integration tests
+integration-tests: ${INTEGRATION_TESTS}
+.PHONY: integration-tests
+
+${BIN}/tests/mksock: \
+    ${OBJ}/tests/mksock.o \
+    ${LIBBFS}
+
+${BIN}/tests/xtouch: \
+    ${OBJ}/tests/xtouch.o \
+    ${LIBBFS}
+
+# `make distcheck` configurations
+DISTCHECKS := distcheck-asan distcheck-tsan distcheck-release
+
+# Don't use msan on macOS
+IS_DARWIN,Darwin := y
+IS_DARWIN := ${IS_DARWIN,${OS}}
+DISTCHECK_MSAN, := distcheck-msan
+DISTCHECKS += ${DISTCHECK_MSAN,${IS_DARWIN}}
+
+# Only add a 32-bit build on 64-bit Linux
+DISTCHECK_M32,Linux,x86_64 := distcheck-m32
+DISTCHECKS += ${DISTCHECK_M32,${OS},${ARCH}}
+
+# Test multiple configurations
+distcheck: ${DISTCHECKS}
+.PHONY: distcheck
+
+# Per-distcheck configuration
+DISTCHECK_CONFIG_asan := ASAN=y UBSAN=y
+DISTCHECK_CONFIG_msan := MSAN=y UBSAN=y CC=clang
+DISTCHECK_CONFIG_tsan := TSAN=y UBSAN=y CC=clang
+DISTCHECK_CONFIG_m32 := EXTRA_CFLAGS="-m32" PKG_CONFIG_PATH=/usr/lib32/pkgconfig USE_LIBURING=n
+DISTCHECK_CONFIG_release := RELEASE=y
+
+${DISTCHECKS}::
+	+${MAKE} -rs BUILDDIR=${BUILDDIR}/$@ config ${DISTCHECK_CONFIG_${@:distcheck-%=%}}
+	+${MAKE} -s BUILDDIR=${BUILDDIR}/$@ check TEST_FLAGS="--sudo --verbose=skipped"
+
+## Packaging (`make install`)
+
+DEST_PREFIX := ${DESTDIR}${PREFIX}
+DEST_MANDIR := ${DESTDIR}${MANDIR}
+
+install::
+	${MKDIR} ${DEST_PREFIX}/bin
+	${INSTALL} -m755 ${BIN}/bfs ${DEST_PREFIX}/bin/bfs
+	${MKDIR} ${DEST_MANDIR}/man1
+	${INSTALL} -m644 docs/bfs.1 ${DEST_MANDIR}/man1/bfs.1
+	${MKDIR} ${DEST_PREFIX}/share/bash-completion/completions
+	${INSTALL} -m644 completions/bfs.bash ${DEST_PREFIX}/share/bash-completion/completions/bfs
+	${MKDIR} ${DEST_PREFIX}/share/zsh/site-functions
+	${INSTALL} -m644 completions/bfs.zsh ${DEST_PREFIX}/share/zsh/site-functions/_bfs
+	${MKDIR} ${DEST_PREFIX}/share/fish/vendor_completions.d
+	${INSTALL} -m644 completions/bfs.fish ${DEST_PREFIX}/share/fish/vendor_completions.d/bfs.fish
+
+uninstall::
+	${RM} ${DEST_PREFIX}/share/bash-completion/completions/bfs
+	${RM} ${DEST_PREFIX}/share/zsh/site-functions/_bfs
+	${RM} ${DEST_PREFIX}/share/fish/vendor_completions.d/bfs.fish
+	${RM} ${DEST_MANDIR}/man1/bfs.1
+	${RM} ${DEST_PREFIX}/bin/bfs
+
+# Check that `make install` works and `make uninstall` removes everything
+check-install::
+	+${MAKE} install DESTDIR=${BUILDDIR}/pkg
+	+${MAKE} uninstall DESTDIR=${BUILDDIR}/pkg
+	${BIN}/bfs ${BUILDDIR}/pkg -not -type d -print -exit 1
+	${RM} -r ${BUILDDIR}/pkg
diff --git a/README.md b/README.md
index 17226fd..b95c16b 100644
--- a/README.md
+++ b/README.md
@@ -333,6 +333,7 @@ Once you have the dependencies, you can build bfs.
 Download one of the [releases](https://github.com/tavianator/bfs/releases) or clone the [git repo](https://github.com/tavianator/bfs).
 Then run
 
+    $ make config
     $ make
 
 This will build the `./bin/bfs` binary.
@@ -342,7 +343,8 @@ Run the test suite to make sure it works correctly:
 
 If you're interested in speed, you may want to build the release version instead:
 
-    $ make release
+    $ make config RELEASE=y
+    $ make
 
 Finally, if you want to install it globally, run
 
diff --git a/config/cc.sh b/config/cc.sh
new file mode 100755
index 0000000..04b142a
--- /dev/null
+++ b/config/cc.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Run the compiler and check if it succeeded
+
+printf '$ %s' "$XCC" >&2
+printf ' %q' "$@" >&2
+printf ' -o /dev/null\n' >&2
+
+$XCC "$@" -o /dev/null
diff --git a/config/empty.c b/config/empty.c
new file mode 100644
index 0000000..4fa9a5b
--- /dev/null
+++ b/config/empty.c
@@ -0,0 +1,6 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+int main(void) {
+	return 0;
+}
diff --git a/config/libacl.c b/config/libacl.c
new file mode 100644
index 0000000..877cb69
--- /dev/null
+++ b/config/libacl.c
@@ -0,0 +1,6 @@
+#include 
+
+int main(void) {
+	acl_free(0);
+	return 0;
+}
diff --git a/config/libcap.c b/config/libcap.c
new file mode 100644
index 0000000..64188ac
--- /dev/null
+++ b/config/libcap.c
@@ -0,0 +1,6 @@
+#include 
+
+int main(void) {
+	cap_free(0);
+	return 0;
+}
diff --git a/config/liburing.c b/config/liburing.c
new file mode 100644
index 0000000..456059c
--- /dev/null
+++ b/config/liburing.c
@@ -0,0 +1,6 @@
+#include 
+
+int main(void) {
+	io_uring_free_probe(0);
+	return 0;
+}
diff --git a/config/oniguruma.c b/config/oniguruma.c
new file mode 100644
index 0000000..b834fac
--- /dev/null
+++ b/config/oniguruma.c
@@ -0,0 +1,6 @@
+#include 
+
+int main(void) {
+	onig_free(0);
+	return 0;
+}
diff --git a/config/pkg.sh b/config/pkg.sh
new file mode 100755
index 0000000..6335b4b
--- /dev/null
+++ b/config/pkg.sh
@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# pkg-config wrapper that outputs a makefile fragment
+
+set -eu
+
+NAME="${1^^}"
+declare -n XUSE="XUSE_$NAME"
+
+if [ "$XUSE" ]; then
+    USE="$XUSE"
+elif [[ "$NOLIBS" == *y* ]]; then
+    USE=n
+elif config/pkgconf.sh "$1"; then
+    USE=y
+else
+    USE=n
+fi
+
+printf '%s := %s\n' "USE_$NAME" "$USE"
+
+if [ "$USE" = y ]; then
+    printf 'CPPFLAGS += -DBFS_USE_%s=1\n' "$NAME"
+
+    CFLAGS=$(config/pkgconf.sh --cflags "$1")
+    if [ "$CFLAGS" ]; then
+        printf 'CFLAGS += %s\n' "$CFLAGS"
+    fi
+
+    LDFLAGS=$(config/pkgconf.sh --ldflags "$1")
+    if [ "$LDFLAGS" ]; then
+        printf 'LDFLAGS += %s\n' "$LDFLAGS"
+    fi
+
+    LDLIBS=$(config/pkgconf.sh --ldlibs "$1")
+    if [ "$LDLIBS" ]; then
+        printf 'LDLIBS += %s\n' "$LDLIBS"
+    fi
+else
+    printf 'CPPFLAGS += -DBFS_USE_%s=0\n' "$NAME"
+fi
diff --git a/config/pkgconf.sh b/config/pkgconf.sh
new file mode 100755
index 0000000..070fad6
--- /dev/null
+++ b/config/pkgconf.sh
@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# pkg-config wrapper with hardcoded fallbacks
+
+set -eu
+
+MODE=
+if [[ "$1" == --* ]]; then
+    MODE="$1"
+    shift
+fi
+
+if command -v "${PKG_CONFIG:-}" &>/dev/null; then
+    case "$MODE" in
+        --cflags)
+            "$PKG_CONFIG" --cflags "$@"
+            ;;
+        --ldflags)
+            "$PKG_CONFIG" --libs-only-L --libs-only-other "$@"
+            ;;
+        --ldlibs)
+            "$PKG_CONFIG" --libs-only-l "$@"
+            ;;
+        "")
+            "$PKG_CONFIG" "$@"
+            ;;
+    esac
+else
+    for lib; do
+        case "$lib" in
+            libacl)
+                LDLIB=-lacl
+                ;;
+            libcap)
+                LDLIB=-lcap
+                ;;
+            liburing)
+                LDLIB=-luring
+                ;;
+            oniguruma)
+                LDLIB=-lonig
+                ;;
+            *)
+                printf 'error: Unknown package %s\n' "$lib" >&2
+                exit 1
+        esac
+
+        case "$MODE" in
+            --ldlibs)
+                printf ' %s' "$LDLIB"
+                ;;
+            "")
+                config/cc.sh "config/$lib.c" "$LDLIB" || exit $?
+                ;;
+        esac
+    done
+
+    if [ "$MODE" = "--ldlibs" ]; then
+        printf '\n'
+    fi
+fi
diff --git a/docs/BUILDING.md b/docs/BUILDING.md
index 7eb3a37..abf6185 100644
--- a/docs/BUILDING.md
+++ b/docs/BUILDING.md
@@ -7,9 +7,10 @@ Compiling
 `bfs` uses [GNU Make](https://www.gnu.org/software/make/) as its build system.
 A simple invocation of
 
+    $ make config
     $ make
 
-should build `bfs` successfully, with no additional steps necessary.
+should build `bfs` successfully.
 As usual with `make`, you can run a [parallel build](https://www.gnu.org/software/make/manual/html_node/Parallel.html) with `-j`.
 For example, to use all your cores, run `make -j$(nproc)`.
 
@@ -17,25 +18,28 @@ For example, to use all your cores, run `make -j$(nproc)`.
 
 | Command          | Description                                                   |
 |------------------|---------------------------------------------------------------|
+| `make config`    | Configures the build system                                   |
 | `make`           | Builds just the `bfs` binary                                  |
 | `make all`       | Builds everything, including the tests (but doesn't run them) |
 | `make check`     | Builds everything, and runs the tests                         |
 | `make install`   | Installs `bfs` (with man page, shell completions, etc.)       |
 | `make uninstall` | Uninstalls `bfs`                                              |
+| `make clean`     | Delete the build products                                     |
+| `make mrclean`   | Delete all generated files, including the build configuration |
 
-### Flag-like targets
+### Build profiles
 
-The build system provides a few shorthand targets for handy configurations:
+The configuration system provides a few shorthand flags for handy configurations:
 
-| Command        | Description                                                 |
-|----------------|-------------------------------------------------------------|
-| `make release` | Build `bfs` with optimizations, LTO, and without assertions |
-| `make asan`    | Enable [AddressSanitizer]                                   |
-| `make lsan`    | Enable [LeakSanitizer]                                      |
-| `make msan`    | Enable [MemorySanitizer]                                    |
-| `make tsan`    | Enable [ThreadSanitizer]                                    |
-| `make ubsan`   | Enable [UndefinedBehaviorSanitizer]                         |
-| `make gcov`    | Enable [code coverage]                                      |
+| Command                 | Description                                                 |
+|-------------------------|-------------------------------------------------------------|
+| `make config RELEASE=y` | Build `bfs` with optimizations, LTO, and without assertions |
+| `make config ASAN=y`    | Enable [AddressSanitizer]                                   |
+| `make config LSAN=y`    | Enable [LeakSanitizer]                                      |
+| `make config MSAN=y`    | Enable [MemorySanitizer]                                    |
+| `make config TSAN=y`    | Enable [ThreadSanitizer]                                    |
+| `make config UBSAN=y`   | Enable [UndefinedBehaviorSanitizer]                         |
+| `make config GCOV=y`    | Enable [code coverage]                                      |
 
 [AddressSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizer
 [LeakSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer#stand-alone-mode
@@ -44,38 +48,38 @@ The build system provides a few shorthand targets for handy configurations:
 [UndefinedBehaviorSanitizer]: https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html
 [code coverage]: https://gcc.gnu.org/onlinedocs/gcc/Gcov.html
 
-You can combine multiple flags and other targets (e.g. `make asan ubsan check`), but not all of them will work together.
+You can combine multiple profiles (e.g. `make config ASAN=y UBSAN=y`), but not all of them will work together.
 
 ### Flags
 
-Other flags are controlled with `make` variables and/or environment variables.
-Here are some of the common ones; check the [`GNUmakefile`](/GNUmakefile) for more.
-
-| Flag                             | Description                                 |
-|----------------------------------|---------------------------------------------|
-| `CC`                             | The C compiler to use, e.g. `make CC=clang` |
-| `CFLAGS`
`EXTRA_CFLAGS`       | Override/add to the default compiler flags  |
-| `LDFLAGS`
`EXTRA_LDFLAGS`     | Override/add to the linker flags            |
-| `USE_ACL`
`USE_LIBCAP`
... | Enable/disable [optional dependencies]      |
-| `TEST_FLAGS`                     | `tests.sh` flags for `make check`           |
-| `BUILDDIR`                       | The build output directory (default: `.`)   |
-| `DESTDIR`                        | The root directory for `make install`       |
-| `PREFIX`                         | The installation prefix (default: `/usr`)   |
-| `MANDIR`                         | The man page installation directory         |
+Other flags can be specified on the `make config` command line or in the environment.
+Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
+
+| Flag                             | Description                                        |
+|----------------------------------|----------------------------------------------------|
+| `CC`                             | The C compiler to use, e.g. `make config CC=clang` |
+| `CFLAGS`
`EXTRA_CFLAGS`       | Override/add to the default compiler flags         |
+| `LDFLAGS`
`EXTRA_LDFLAGS`     | Override/add to the linker flags                   |
+| `USE_ACL`
`USE_LIBCAP`
... | Enable/disable [optional dependencies]             |
+| `TEST_FLAGS`                     | `tests.sh` flags for `make check`                  |
+| `BUILDDIR`                       | The build output directory (default: `.`)          |
+| `DESTDIR`                        | The root directory for `make install`              |
+| `PREFIX`                         | The installation prefix (default: `/usr`)          |
+| `MANDIR`                         | The man page installation directory                |
 
 [optional dependencies]: #dependencies
 
 ### Dependencies
 
 `bfs` depends on some system libraries for some of its features.
-These dependencies are optional, and can be turned off at build time if necessary by setting the appropriate variable to the empty string (e.g. `make USE_ONIGURUMA=`).
+These dependencies are optional, and can be turned off in `make config` if necessary by setting the appropriate variable to `n` (e.g. `make config USE_ONIGURUMA=n`).
 
-| Dependency  | Platforms  | `make` flag     |
-|-------------|------------|-----------------|
-| [acl]       | Linux only | `USE_ACL`       |
-| [libcap]    | Linux only | `USE_LIBCAP`    |
-| [liburing]  | Linux only | `USE_LIBURING`  |
-| [Oniguruma] | All        | `USE_ONIGURUMA` |
+| Dependency  | Platforms  | `make config` flag |
+|-------------|------------|--------------------|
+| [acl]       | Linux only | `USE_ACL`          |
+| [libcap]    | Linux only | `USE_LIBCAP`       |
+| [liburing]  | Linux only | `USE_LIBURING`     |
+| [Oniguruma] | All        | `USE_ONIGURUMA`    |
 
 [acl]: https://savannah.nongnu.org/projects/acl
 [libcap]: https://sites.google.com/site/fullycapable/
@@ -84,21 +88,22 @@ These dependencies are optional, and can be turned off at build time if necessar
 
 ### Dependency tracking
 
-The build system automatically tracks header dependencies with the `-M` family of compiler options (see `DEPFLAGS` in the [`GNUmakefile`](/GNUmakefile)).
+The build system automatically tracks header dependencies with the `-M` family of compiler options (see `DEPFLAGS` in the [`Makefile`](/Makefile)).
 So if you edit a header file, `make` will rebuild the necessary object files ensuring they don't go out of sync.
 
+We also add a dependency on the current configuration, so you can change configurations and rebuild without having to `make clean`.
+
 We go one step further than most build systems by tracking the flags that were used for the previous compilation.
 That means you can change configurations without having to `make clean`.
 For example,
 
+    $ make config
+    $ make
+    $ make config RELEASE=y
     $ make
-    $ make release
 
 will build the project in debug mode and then rebuild it in release mode.
 
-A side effect of this may be surprising: `make check` by itself will rebuild the project in the default configuration.
-To test a different configuration, you'll have to repeat it (e.g. `make release check`).
-
 
 Testing
 -------
diff --git a/docs/USAGE.md b/docs/USAGE.md
index 071c95b..70f8475 100644
--- a/docs/USAGE.md
+++ b/docs/USAGE.md
@@ -7,8 +7,8 @@ When invoked with no arguments, `bfs` will list everything under the current dir
 ```console
 $ bfs
 .
-./GNUmakefile
 ./LICENSE
+./Makefile
 ./README.md
 ./completions
 ./docs
diff --git a/src/config.h b/src/config.h
index 506ad3e..2eff1fc 100644
--- a/src/config.h
+++ b/src/config.h
@@ -29,13 +29,14 @@
 #ifndef BFS_COMMAND
 #  define BFS_COMMAND "bfs"
 #endif
-#ifndef BFS_VERSION
-#  define BFS_VERSION "3.1.3"
-#endif
 #ifndef BFS_HOMEPAGE
 #  define BFS_HOMEPAGE "https://tavianator.com/projects/bfs.html"
 #endif
 
+// This is a symbol instead of a literal so we don't have to rebuild everything
+// when the version number changes
+extern const char bfs_version[];
+
 // Check for system headers
 
 #ifdef __has_include
@@ -97,10 +98,10 @@
 #  define BFS_USE_PATHS_H BFS_HAS_PATHS_H
 #endif
 #ifndef BFS_USE_SYS_ACL_H
-#  define BFS_USE_SYS_ACL_H (BFS_HAS_SYS_ACL_H && !__illumos__)
+#  define BFS_USE_SYS_ACL_H (BFS_HAS_SYS_ACL_H && !__illumos__ && (!__linux__ || BFS_USE_LIBACL))
 #endif
 #ifndef BFS_USE_SYS_CAPABILITY_H
-#  define BFS_USE_SYS_CAPABILITY_H (BFS_HAS_SYS_CAPABILITY_H && !__FreeBSD__)
+#  define BFS_USE_SYS_CAPABILITY_H (BFS_HAS_SYS_CAPABILITY_H && !__FreeBSD__ && (!__linux__ || BFS_USE_LIBCAP))
 #endif
 #ifndef BFS_USE_SYS_EXTATTR_H
 #  define BFS_USE_SYS_EXTATTR_H (BFS_HAS_SYS_EXTATTR_H && !__DragonFly__)
diff --git a/src/main.c b/src/main.c
index e120f03..b4d65ce 100644
--- a/src/main.c
+++ b/src/main.c
@@ -40,6 +40,7 @@
  *     - thread.h      (multi-threading)
  *     - trie.[ch]     (a trie set/map implementation)
  *     - typo.[ch]     (fuzzy matching for typos)
+ *     - version.c     (defines the version number)
  *     - xregex.[ch]   (regular expression support)
  *     - xspawn.[ch]   (spawns processes)
  *     - xtime.[ch]    (date/time handling utilities)
diff --git a/src/parse.c b/src/parse.c
index 2dfcab2..38ebf3f 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -2909,7 +2909,7 @@ static struct bfs_expr *parse_help(struct bfs_parser *parser, int arg1, int arg2
  * "Parse" -version.
  */
 static struct bfs_expr *parse_version(struct bfs_parser *parser, int arg1, int arg2) {
-	cfprintf(parser->ctx->cout, "${ex}%s${rs} ${bld}%s${rs}\n\n", BFS_COMMAND, BFS_VERSION);
+	cfprintf(parser->ctx->cout, "${ex}%s${rs} ${bld}%s${rs}\n\n", BFS_COMMAND, bfs_version);
 
 	printf("%s\n", BFS_HOMEPAGE);
 
diff --git a/src/version.c b/src/version.c
new file mode 100644
index 0000000..736f3d5
--- /dev/null
+++ b/src/version.c
@@ -0,0 +1,6 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include "config.h"
+
+const char bfs_version[] = BFS_VERSION;
diff --git a/tests/run.sh b/tests/run.sh
index 720515d..ab1ed6d 100644
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -156,7 +156,7 @@ comake() {
              -f "$TESTS/tests.mk" \
              DONE=$DONE_PIPE \
              READY=$READY_PIPE \
-             "${TEST_CASES[@]/#/tests/}" \
+             "${!TEST_CASES[@]}" \
              /dev/null
     }
 
diff --git a/tests/tests.mk b/tests/tests.mk
index 5bf4f6c..035ca79 100644
--- a/tests/tests.mk
+++ b/tests/tests.mk
@@ -1,7 +1,13 @@
 # Copyright © Tavian Barnes 
 # SPDX-License-Identifier: 0BSD
 
-# GNU makefile that exposes make's job control to tests.sh
+# Makefile that exposes make's job control to tests.sh
 
-tests/%:
+# BSD make will chdir into ${.OBJDIR} by default, unless we tell it not to
+.OBJDIR: .
+
+# Turn off implicit rules
+.SUFFIXES:
+
+.DEFAULT::
 	bash -c 'printf . >&$(READY) && read -r -N1 -u$(DONE)'
-- 
cgit v1.2.3


From 30e309de41aaca259c4d0a200daa42ba74cbc5a5 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Mon, 22 Apr 2024 19:11:42 +0000
Subject: build(deps): bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-action/compare/v3...v4)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] 
---
 .github/workflows/codecov.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to '.github/workflows/codecov.yml')

diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 2abe531..2245f40 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -29,7 +29,7 @@ jobs:
           make -j$(nproc) check TEST_FLAGS="--sudo"
           gcov -abcfpu obj/*/*.o
 
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true
-- 
cgit v1.2.3


From 37caa3d71fd8bb4d0d9204e4a2f5cac234fa25fd Mon Sep 17 00:00:00 2001
From: Tavian Barnes 
Date: Mon, 29 Apr 2024 15:30:39 -0400
Subject: build: Replace `make config` with a `./configure` script

This lets us do more traditional out-of-tree builds like

    $ ../path/to/bfs/configure
    $ make

The .mk files are moved from ./config to ./build, mostly so that
./configure will auto-complete easily.
---
 .github/workflows/ci.yml              |   8 +-
 .github/workflows/codecov.yml         |   2 +-
 .github/workflows/codeql.yml          |   2 +-
 Makefile                              | 143 +++++++++++++++---------------
 README.md                             |   4 +-
 bench/bench.sh                        |   6 +-
 build/cc.sh                           |  16 ++++
 build/config.mk                       |  62 +++++++++++++
 build/define-if.sh                    |  20 +++++
 build/deps.mk                         |  18 ++++
 build/empty.c                         |   6 ++
 build/exports.mk                      |  20 +++++
 build/flags.mk                        | 136 ++++++++++++++++++++++++++++
 build/has/acl-get-entry.c             |   8 ++
 build/has/acl-get-file.c              |   8 ++
 build/has/acl-get-tag-type.c          |  10 +++
 build/has/acl-is-trivial-np.c         |  12 +++
 build/has/acl-trivial.c               |   8 ++
 build/has/aligned-alloc.c             |   8 ++
 build/has/confstr.c                   |   9 ++
 build/has/extattr-get-file.c          |  10 +++
 build/has/extattr-get-link.c          |  10 +++
 build/has/extattr-list-file.c         |  10 +++
 build/has/extattr-list-link.c         |  10 +++
 build/has/fdclosedir.c                |   8 ++
 build/has/getdents.c                  |  10 +++
 build/has/getdents64-syscall.c        |  12 +++
 build/has/getdents64.c                |  10 +++
 build/has/getprogname-gnu.c           |   9 ++
 build/has/getprogname.c               |   9 ++
 build/has/max-align-t.c               |   8 ++
 build/has/pipe2.c                     |  10 +++
 build/has/posix-spawn-addfchdir-np.c  |  11 +++
 build/has/posix-spawn-addfchdir.c     |  11 +++
 build/has/st-acmtim.c                 |  12 +++
 build/has/st-acmtimespec.c            |  12 +++
 build/has/st-birthtim.c               |   9 ++
 build/has/st-birthtimespec.c          |   9 ++
 build/has/st-flags.c                  |   9 ++
 build/has/statx-syscall.c             |  13 +++
 build/has/statx.c                     |  11 +++
 build/has/strerror-l.c                |  11 +++
 build/has/strerror-r-gnu.c            |  11 +++
 build/has/strerror-r-posix.c          |  11 +++
 build/has/tm-gmtoff.c                 |   9 ++
 build/has/uselocale.c                 |   9 ++
 build/header.mk                       |  69 +++++++++++++++
 build/pkgconf.sh                      | 100 +++++++++++++++++++++
 build/pkgs.mk                         |  36 ++++++++
 build/prelude.mk                      | 133 ++++++++++++++++++++++++++++
 build/use/libacl.c                    |   9 ++
 build/use/libcap.c                    |   9 ++
 build/use/libselinux.c                |   9 ++
 build/use/liburing.c                  |   9 ++
 build/use/oniguruma.c                 |   9 ++
 config/cc.sh                          |  16 ----
 config/config.mk                      |  63 -------------
 config/define-if.sh                   |  20 -----
 config/deps.mk                        |  18 ----
 config/empty.c                        |   6 --
 config/exports.mk                     |  20 -----
 config/flags.mk                       | 136 ----------------------------
 config/has/acl-get-entry.c            |   8 --
 config/has/acl-get-file.c             |   8 --
 config/has/acl-get-tag-type.c         |  10 ---
 config/has/acl-is-trivial-np.c        |  12 ---
 config/has/acl-trivial.c              |   8 --
 config/has/aligned-alloc.c            |   8 --
 config/has/confstr.c                  |   9 --
 config/has/extattr-get-file.c         |  10 ---
 config/has/extattr-get-link.c         |  10 ---
 config/has/extattr-list-file.c        |  10 ---
 config/has/extattr-list-link.c        |  10 ---
 config/has/fdclosedir.c               |   8 --
 config/has/getdents.c                 |  10 ---
 config/has/getdents64-syscall.c       |  12 ---
 config/has/getdents64.c               |  10 ---
 config/has/getprogname-gnu.c          |   9 --
 config/has/getprogname.c              |   9 --
 config/has/max-align-t.c              |   8 --
 config/has/pipe2.c                    |  10 ---
 config/has/posix-spawn-addfchdir-np.c |  11 ---
 config/has/posix-spawn-addfchdir.c    |  11 ---
 config/has/st-acmtim.c                |  12 ---
 config/has/st-acmtimespec.c           |  12 ---
 config/has/st-birthtim.c              |   9 --
 config/has/st-birthtimespec.c         |   9 --
 config/has/st-flags.c                 |   9 --
 config/has/statx-syscall.c            |  13 ---
 config/has/statx.c                    |  11 ---
 config/has/strerror-l.c               |  11 ---
 config/has/strerror-r-gnu.c           |  11 ---
 config/has/strerror-r-posix.c         |  11 ---
 config/has/tm-gmtoff.c                |   9 --
 config/has/uselocale.c                |   9 --
 config/header.mk                      |  69 ---------------
 config/pkgconf.sh                     | 100 ---------------------
 config/pkgs.mk                        |  36 --------
 config/prelude.mk                     | 162 ----------------------------------
 config/use/libacl.c                   |   9 --
 config/use/libcap.c                   |   9 --
 config/use/libselinux.c               |   9 --
 config/use/liburing.c                 |   9 --
 config/use/oniguruma.c                |   9 --
 configure                             |  98 ++++++++++++++++++++
 docs/BUILDING.md                      |  47 +++++-----
 tests/util.sh                         |   9 +-
 tests/xspawn.c                        |  15 +---
 108 files changed, 1199 insertions(+), 1141 deletions(-)
 create mode 100755 build/cc.sh
 create mode 100644 build/config.mk
 create mode 100755 build/define-if.sh
 create mode 100644 build/deps.mk
 create mode 100644 build/empty.c
 create mode 100644 build/exports.mk
 create mode 100644 build/flags.mk
 create mode 100644 build/has/acl-get-entry.c
 create mode 100644 build/has/acl-get-file.c
 create mode 100644 build/has/acl-get-tag-type.c
 create mode 100644 build/has/acl-is-trivial-np.c
 create mode 100644 build/has/acl-trivial.c
 create mode 100644 build/has/aligned-alloc.c
 create mode 100644 build/has/confstr.c
 create mode 100644 build/has/extattr-get-file.c
 create mode 100644 build/has/extattr-get-link.c
 create mode 100644 build/has/extattr-list-file.c
 create mode 100644 build/has/extattr-list-link.c
 create mode 100644 build/has/fdclosedir.c
 create mode 100644 build/has/getdents.c
 create mode 100644 build/has/getdents64-syscall.c
 create mode 100644 build/has/getdents64.c
 create mode 100644 build/has/getprogname-gnu.c
 create mode 100644 build/has/getprogname.c
 create mode 100644 build/has/max-align-t.c
 create mode 100644 build/has/pipe2.c
 create mode 100644 build/has/posix-spawn-addfchdir-np.c
 create mode 100644 build/has/posix-spawn-addfchdir.c
 create mode 100644 build/has/st-acmtim.c
 create mode 100644 build/has/st-acmtimespec.c
 create mode 100644 build/has/st-birthtim.c
 create mode 100644 build/has/st-birthtimespec.c
 create mode 100644 build/has/st-flags.c
 create mode 100644 build/has/statx-syscall.c
 create mode 100644 build/has/statx.c
 create mode 100644 build/has/strerror-l.c
 create mode 100644 build/has/strerror-r-gnu.c
 create mode 100644 build/has/strerror-r-posix.c
 create mode 100644 build/has/tm-gmtoff.c
 create mode 100644 build/has/uselocale.c
 create mode 100644 build/header.mk
 create mode 100755 build/pkgconf.sh
 create mode 100644 build/pkgs.mk
 create mode 100644 build/prelude.mk
 create mode 100644 build/use/libacl.c
 create mode 100644 build/use/libcap.c
 create mode 100644 build/use/libselinux.c
 create mode 100644 build/use/liburing.c
 create mode 100644 build/use/oniguruma.c
 delete mode 100755 config/cc.sh
 delete mode 100644 config/config.mk
 delete mode 100755 config/define-if.sh
 delete mode 100644 config/deps.mk
 delete mode 100644 config/empty.c
 delete mode 100644 config/exports.mk
 delete mode 100644 config/flags.mk
 delete mode 100644 config/has/acl-get-entry.c
 delete mode 100644 config/has/acl-get-file.c
 delete mode 100644 config/has/acl-get-tag-type.c
 delete mode 100644 config/has/acl-is-trivial-np.c
 delete mode 100644 config/has/acl-trivial.c
 delete mode 100644 config/has/aligned-alloc.c
 delete mode 100644 config/has/confstr.c
 delete mode 100644 config/has/extattr-get-file.c
 delete mode 100644 config/has/extattr-get-link.c
 delete mode 100644 config/has/extattr-list-file.c
 delete mode 100644 config/has/extattr-list-link.c
 delete mode 100644 config/has/fdclosedir.c
 delete mode 100644 config/has/getdents.c
 delete mode 100644 config/has/getdents64-syscall.c
 delete mode 100644 config/has/getdents64.c
 delete mode 100644 config/has/getprogname-gnu.c
 delete mode 100644 config/has/getprogname.c
 delete mode 100644 config/has/max-align-t.c
 delete mode 100644 config/has/pipe2.c
 delete mode 100644 config/has/posix-spawn-addfchdir-np.c
 delete mode 100644 config/has/posix-spawn-addfchdir.c
 delete mode 100644 config/has/st-acmtim.c
 delete mode 100644 config/has/st-acmtimespec.c
 delete mode 100644 config/has/st-birthtim.c
 delete mode 100644 config/has/st-birthtimespec.c
 delete mode 100644 config/has/st-flags.c
 delete mode 100644 config/has/statx-syscall.c
 delete mode 100644 config/has/statx.c
 delete mode 100644 config/has/strerror-l.c
 delete mode 100644 config/has/strerror-r-gnu.c
 delete mode 100644 config/has/strerror-r-posix.c
 delete mode 100644 config/has/tm-gmtoff.c
 delete mode 100644 config/has/uselocale.c
 delete mode 100644 config/header.mk
 delete mode 100755 config/pkgconf.sh
 delete mode 100644 config/pkgs.mk
 delete mode 100644 config/prelude.mk
 delete mode 100644 config/use/libacl.c
 delete mode 100644 config/use/libcap.c
 delete mode 100644 config/use/libselinux.c
 delete mode 100644 config/use/liburing.c
 delete mode 100644 config/use/oniguruma.c
 create mode 100755 configure

(limited to '.github/workflows/codecov.yml')

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3890bb0..57f59f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -107,7 +107,7 @@ jobs:
                 gmake \
                 oniguruma
             jobs=$(sysctl -n hw.ncpu)
-            gmake -j$jobs config
+            MAKE=gmake ./configure
             gmake -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
 
   netbsd:
@@ -133,7 +133,7 @@ jobs:
                 pkgconf \
                 tcl-expect
             jobs=$(sysctl -n hw.ncpu)
-            make -j$jobs config
+            ./configure
             make -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
 
   dragonflybsd:
@@ -165,7 +165,7 @@ jobs:
           run: |
             chown -R action:action .
             jobs=$(sysctl -n hw.ncpu)
-            sudo -u action make config
+            sudo -u action ./configure
             sudo -u action make -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
 
   omnios:
@@ -198,5 +198,5 @@ jobs:
             PATH="/usr/xpg4/bin:$PATH"
             chown -R action:staff .
             jobs=$(getconf NPROCESSORS_ONLN)
-            sudo -u action gmake config
+            sudo -u action MAKE=gmake ./configure
             sudo -u action gmake -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 2245f40..bb68927 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -25,7 +25,7 @@ jobs:
 
       - name: Generate coverage
         run: |
-          make config GCOV=y
+          ./configure GCOV=y
           make -j$(nproc) check TEST_FLAGS="--sudo"
           gcov -abcfpu obj/*/*.o
 
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index c21fda5..a0b8fe3 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -41,7 +41,7 @@ jobs:
 
       - name: Configure
         run: |
-          make -j$(nproc) config
+          ./configure
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
diff --git a/Makefile b/Makefile
index 981c322..2fb35fd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,56 +1,50 @@
 # Copyright © Tavian Barnes 
 # SPDX-License-Identifier: 0BSD
 
-# This Makefile implements the configuration and build steps for bfs.  It is
-# portable to both GNU make and most BSD make implementations.  To build bfs,
-# run
+# To build bfs, run
 #
-#     $ make config
+#     $ ./configure
 #     $ make
 
 # Utilities and GNU/BSD portability
-include config/prelude.mk
+include build/prelude.mk
 
 # The default build target
 default: bfs
 .PHONY: default
 
 # Include the generated build config, if it exists
--include ${CONFIG}
+-include gen/config.mk
 
-## Configuration phase (`make config`)
-
-# The configuration goal itself
-config::
-	@+${MAKE} -sf config/config.mk
+## Configuration phase (`./configure`)
 
 # bfs used to have flag-like targets (`make release`, `make asan ubsan`, etc.).
 # Direct users to the new configuration system.
 asan lsan msan tsan ubsan gcov lint release::
-	@printf 'error: `%s %s` is no longer supported. ' "${MAKE}" $@ >&2
-	@printf 'Use `%s config %s=y` instead.\n' "${MAKE}" $$(echo $@ | tr 'a-z' 'A-Z') >&2
+	@printf 'error: `%s %s` is no longer supported. Use `./configure %s=y` instead.\n' \
+	    "${MAKE}" $@ $$(echo $@ | tr 'a-z' 'A-Z') >&2
 	@false
 
-# Print an error if `make` is run before `make config`
-${CONFIG}::
+# Print an error if `make` is run before `./configure`
+gen/config.mk::
 	@if ! [ -e $@ ]; then \
-	    printf 'error: You must run `%s config` before `%s`.\n' "${MAKE}" "${MAKE}" >&2; \
+	    printf 'error: You must run `./configure` before `%s`.\n' "${MAKE}" >&2; \
 	    false; \
 	fi
 
 ## Build phase (`make`)
 
 # The main binary
-bfs: ${BIN}/bfs
+bfs: bin/bfs
 .PHONY: bfs
 
 # All binaries
 BINS := \
-    ${BIN}/bfs \
-    ${BIN}/tests/mksock \
-    ${BIN}/tests/units \
-    ${BIN}/tests/xspawnee \
-    ${BIN}/tests/xtouch
+    bin/bfs \
+    bin/tests/mksock \
+    bin/tests/units \
+    bin/tests/xspawnee \
+    bin/tests/xtouch
 
 all: ${BINS}
 .PHONY: all
@@ -60,52 +54,50 @@ ALL_CFLAGS = ${CPPFLAGS} ${CFLAGS} ${DEPFLAGS}
 ALL_LDFLAGS = ${CFLAGS} ${LDFLAGS}
 
 # The main binary
-${BIN}/bfs: ${LIBBFS} ${OBJ}/src/main.o
+bin/bfs: ${LIBBFS} obj/src/main.o
 
 ${BINS}:
 	@${MKDIR} ${@D}
-	+${MSG} "[ LD ] ${TGT}" ${CC} ${ALL_LDFLAGS} ${.ALLSRC} ${LDLIBS} -o $@
+	+${MSG} "[ LD ] $@" ${CC} ${ALL_LDFLAGS} ${.ALLSRC} ${LDLIBS} -o $@
 	${POSTLINK}
 
 # Get the .c file for a .o file
-_CSRC = ${@:${OBJ}/%.o=%.c}
-CSRC = ${_CSRC:gen/%=${GEN}/%}
+CSRC = ${@:obj/%.o=%.c}
 
-# Depend on ${CONFIG} to make sure `make config` runs first, and to rebuild when
-# the configuration changes
-${OBJS}: ${CONFIG}
+# Rebuild when the configuration changes
+${OBJS}: gen/config.mk
 	@${MKDIR} ${@D}
-	${MSG} "[ CC ] ${_CSRC}" ${CC} ${ALL_CFLAGS} -c ${CSRC} -o $@
+	${MSG} "[ CC ] ${CSRC}" ${CC} ${ALL_CFLAGS} -c ${CSRC} -o $@
 
 # Save the version number to this file, but only update version.c if it changes
-${GEN}/version.c.new::
+gen/version.c.new::
 	@${MKDIR} ${@D}
 	@printf 'const char bfs_version[] = "' >$@
 	@if [ "$$VERSION" ]; then \
 	    printf '%s' "$$VERSION"; \
-	elif test -d .git && command -v git >/dev/null 2>&1; then \
-	    git describe --always --dirty; \
+	elif test -e src/../.git && command -v git >/dev/null 2>&1; then \
+	    git -C src/.. describe --always --dirty; \
 	else \
 	    echo "3.1.3"; \
 	fi | tr -d '\n' >>$@
 	@printf '";\n' >>$@
 
-${GEN}/version.c: ${GEN}/version.c.new
+gen/version.c: gen/version.c.new
 	@test -e $@ && cmp -s $@ ${.ALLSRC} && rm ${.ALLSRC} || mv ${.ALLSRC} $@
 
-${OBJ}/gen/version.o: ${GEN}/version.c
+obj/gen/version.o: gen/version.c
 
 ## Test phase (`make check`)
 
 # Unit test binaries
 UTEST_BINS := \
-    ${BIN}/tests/units \
-    ${BIN}/tests/xspawnee
+    bin/tests/units \
+    bin/tests/xspawnee
 
 # Integration test binaries
 ITEST_BINS := \
-    ${BIN}/tests/mksock \
-    ${BIN}/tests/xtouch
+    bin/tests/mksock \
+    bin/tests/xtouch
 
 # Build (but don't run) test binaries
 tests: ${UTEST_BINS} ${ITEST_BINS}
@@ -117,45 +109,45 @@ check: unit-tests integration-tests
 
 # Run the unit tests
 unit-tests: ${UTEST_BINS}
-	${MSG} "[TEST] tests/units" ${BIN}/tests/units
+	${MSG} "[TEST] tests/units" bin/tests/units
 .PHONY: unit-tests
 
-${BIN}/tests/units: \
+bin/tests/units: \
     ${UNIT_OBJS} \
     ${LIBBFS}
 
-${BIN}/tests/xspawnee: \
-    ${OBJ}/tests/xspawnee.o
+bin/tests/xspawnee: \
+    obj/tests/xspawnee.o
 
 # The different flag combinations we check
 INTEGRATIONS := default dfs ids eds j1 j2 j3 s
 INTEGRATION_TESTS := ${INTEGRATIONS:%=check-%}
 
 # Check just `bfs`
-check-default: ${BIN}/bfs ${ITEST_BINS}
+check-default: bin/bfs ${ITEST_BINS}
 	+${MSG} "[TEST] bfs" \
-	    ./tests/tests.sh --make="${MAKE}" --bfs="${BIN}/bfs" ${TEST_FLAGS}
+	    ./tests/tests.sh --make="${MAKE}" --bfs="bin/bfs" ${TEST_FLAGS}
 
 # Check the different search strategies
-check-dfs check-ids check-eds: ${BIN}/bfs ${ITEST_BINS}
+check-dfs check-ids check-eds: bin/bfs ${ITEST_BINS}
 	+${MSG} "[TEST] bfs -S ${@:check-%=%}" \
-	    ./tests/tests.sh --make="${MAKE}" --bfs="${BIN}/bfs -S ${@:check-%=%}" ${TEST_FLAGS}
+	    ./tests/tests.sh --make="${MAKE}" --bfs="bin/bfs -S ${@:check-%=%}" ${TEST_FLAGS}
 
 # Check various flags
-check-j1 check-j2 check-j3 check-s: ${BIN}/bfs ${ITEST_BINS}
+check-j1 check-j2 check-j3 check-s: bin/bfs ${ITEST_BINS}
 	+${MSG} "[TEST] bfs -${@:check-%=%}" \
-	    ./tests/tests.sh --make="${MAKE}" --bfs="${BIN}/bfs -${@:check-%=%}" ${TEST_FLAGS}
+	    ./tests/tests.sh --make="${MAKE}" --bfs="bin/bfs -${@:check-%=%}" ${TEST_FLAGS}
 
 # Run the integration tests
 integration-tests: ${INTEGRATION_TESTS}
 .PHONY: integration-tests
 
-${BIN}/tests/mksock: \
-    ${OBJ}/tests/mksock.o \
+bin/tests/mksock: \
+    obj/tests/mksock.o \
     ${LIBBFS}
 
-${BIN}/tests/xtouch: \
-    ${OBJ}/tests/xtouch.o \
+bin/tests/xtouch: \
+    obj/tests/xtouch.o \
     ${LIBBFS}
 
 # `make distcheck` configurations
@@ -183,8 +175,10 @@ DISTCHECK_CONFIG_m32 := EXTRA_CFLAGS="-m32" PKG_CONFIG_LIBDIR=/usr/lib32/pkgconf
 DISTCHECK_CONFIG_release := RELEASE=y
 
 ${DISTCHECKS}::
-	+${MAKE} -rs BUILDDIR=${BUILDDIR}/$@ config ${DISTCHECK_CONFIG_${@:distcheck-%=%}}
-	+${MAKE} -s BUILDDIR=${BUILDDIR}/$@ check TEST_FLAGS="--sudo --verbose=skipped"
+	@${MKDIR} $@
+	@+cd $@ \
+	    && ../configure ${DISTCHECK_CONFIG_${@:distcheck-%=%}} \
+	    && ${MAKE} -s check TEST_FLAGS="--sudo --verbose=skipped"
 
 ## Packaging (`make install`)
 
@@ -193,44 +187,49 @@ DEST_MANDIR := ${DESTDIR}${MANDIR}
 
 install::
 	${Q}${MKDIR} ${DEST_PREFIX}/bin
-	${MSG} "[INSTALL] bin/bfs" \
-	    ${INSTALL} -m755 ${BIN}/bfs ${DEST_PREFIX}/bin/bfs
+	${MSG} "[INST] bin/bfs" \
+	    ${INSTALL} -m755 bin/bfs ${DEST_PREFIX}/bin/bfs
 	${Q}${MKDIR} ${DEST_MANDIR}/man1
-	${MSG} "[INSTALL] man/man1/bfs.1" \
+	${MSG} "[INST] man/man1/bfs.1" \
 	    ${INSTALL} -m644 docs/bfs.1 ${DEST_MANDIR}/man1/bfs.1
 	${Q}${MKDIR} ${DEST_PREFIX}/share/bash-completion/completions
-	${MSG} "[INSTALL] completions/bfs.bash" \
+	${MSG} "[INST] completions/bfs.bash" \
 	    ${INSTALL} -m644 completions/bfs.bash ${DEST_PREFIX}/share/bash-completion/completions/bfs
 	${Q}${MKDIR} ${DEST_PREFIX}/share/zsh/site-functions
-	${MSG} "[INSTALL] completions/bfs.zsh" \
+	${MSG} "[INST] completions/bfs.zsh" \
 	    ${INSTALL} -m644 completions/bfs.zsh ${DEST_PREFIX}/share/zsh/site-functions/_bfs
 	${Q}${MKDIR} ${DEST_PREFIX}/share/fish/vendor_completions.d
-	${MSG} "[INSTALL] completions/bfs.fish" \
+		${MSG} "[INST] completions/bfs.fish" \
 	    ${INSTALL} -m644 completions/bfs.fish ${DEST_PREFIX}/share/fish/vendor_completions.d/bfs.fish
 
 uninstall::
-	${RM} ${DEST_PREFIX}/share/bash-completion/completions/bfs
-	${RM} ${DEST_PREFIX}/share/zsh/site-functions/_bfs
-	${RM} ${DEST_PREFIX}/share/fish/vendor_completions.d/bfs.fish
-	${RM} ${DEST_MANDIR}/man1/bfs.1
-	${RM} ${DEST_PREFIX}/bin/bfs
+	${MSG} "[ RM ] completions/bfs.bash" \
+	    ${RM} ${DEST_PREFIX}/share/bash-completion/completions/bfs
+	${MSG} "[ RM ] completions/bfs.zsh" \
+	    ${RM} ${DEST_PREFIX}/share/zsh/site-functions/_bfs
+	${MSG} "[ RM ] completions/bfs.fish" \
+	    ${RM} ${DEST_PREFIX}/share/fish/vendor_completions.d/bfs.fish
+	${MSG} "[ RM ] man/man1/bfs.1" \
+	    ${RM} ${DEST_MANDIR}/man1/bfs.1
+	${MSG} "[ RM ] bin/bfs" \
+	    ${RM} ${DEST_PREFIX}/bin/bfs
 
 # Check that `make install` works and `make uninstall` removes everything
 check-install::
-	+${MAKE} install DESTDIR=${BUILDDIR}/pkg
-	+${MAKE} uninstall DESTDIR=${BUILDDIR}/pkg
-	${BIN}/bfs ${BUILDDIR}/pkg -not -type d -print -exit 1
-	${RM} -r ${BUILDDIR}/pkg
+	+${MAKE} install DESTDIR=pkg
+	+${MAKE} uninstall DESTDIR=pkg
+	bin/bfs pkg -not -type d -print -exit 1
+	${RM} -r pkg
 
 ## Cleanup (`make clean`)
 
 # Clean all build products
 clean::
 	${MSG} "[ RM ] bin obj" \
-	    ${RM} -r ${BIN} ${OBJ}
+	    ${RM} -r bin obj
 
 # Clean everything, including generated files
 distclean: clean
 	${MSG} "[ RM ] gen" \
-	    ${RM} -r ${GEN} ${DISTCHECKS}
+	    ${RM} -r gen ${DISTCHECKS}
 .PHONY: distclean
diff --git a/README.md b/README.md
index b95c16b..922ebdc 100644
--- a/README.md
+++ b/README.md
@@ -333,7 +333,7 @@ Once you have the dependencies, you can build bfs.
 Download one of the [releases](https://github.com/tavianator/bfs/releases) or clone the [git repo](https://github.com/tavianator/bfs).
 Then run
 
-    $ make config
+    $ ./configure
     $ make
 
 This will build the `./bin/bfs` binary.
@@ -343,7 +343,7 @@ Run the test suite to make sure it works correctly:
 
 If you're interested in speed, you may want to build the release version instead:
 
-    $ make config RELEASE=y
+    $ ./configure RELEASE=y
     $ make
 
 Finally, if you want to install it globally, run
diff --git a/bench/bench.sh b/bench/bench.sh
index 1526fe5..ba46599 100644
--- a/bench/bench.sh
+++ b/bench/bench.sh
@@ -221,7 +221,7 @@ setup() {
     fi
 
     echo "Building bfs ..."
-    as-user make -s -j"$nproc" RELEASE=y
+    as-user ./configure RELEASE=y
     as-user make -s -j"$nproc" all
 
     as-user mkdir -p bench/corpus
@@ -254,8 +254,8 @@ setup() {
                 echo "Building bfs $commit ..."
                 cd "$worktree"
                 as-user git checkout -qd "$commit" --
-                if [ -e config ]; then
-                    as-user make -s -j"$nproc" config RELEASE=1
+                if [ -e configure ]; then
+                    as-user ./configure RELEASE=1
                     as-user make -s -j"$nproc"
                 else
                     as-user make -s -j"$nproc" release
diff --git a/build/cc.sh b/build/cc.sh
new file mode 100755
index 0000000..45d51ca
--- /dev/null
+++ b/build/cc.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Run the compiler and check if it succeeded
+
+set -eu
+
+TMP=$(mktemp)
+trap 'rm -f "$TMP"' EXIT
+
+(
+    set -x
+    $XCC $XCPPFLAGS $XCFLAGS $XLDFLAGS "$@" $XLDLIBS -o "$TMP"
+)
diff --git a/build/config.mk b/build/config.mk
new file mode 100644
index 0000000..153838d
--- /dev/null
+++ b/build/config.mk
@@ -0,0 +1,62 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Makefile that implements `./configure`
+
+include build/prelude.mk
+include build/exports.mk
+
+# All configuration steps
+config: gen/config.mk gen/config.h
+.PHONY: config
+
+# Makefile fragments generated by `./configure`
+MKS := \
+    gen/vars.mk \
+    gen/flags.mk \
+    gen/deps.mk \
+    gen/pkgs.mk
+
+# The main configuration file, which includes the others
+gen/config.mk: ${MKS}
+	${MSG} "[ GEN] $@"
+	@printf '# %s\n' "$@" >$@
+	@printf 'include %s\n' ${.ALLSRC} >>$@
+	${VCAT} gen/config.mk
+.PHONY: gen/config.mk
+
+# Saves the configurable variables
+gen/vars.mk::
+	@${MKDIR} ${@D}
+	${MSG} "[ GEN] $@"
+	@printf '# %s\n' "$@" >$@
+	@printf 'PREFIX := %s\n' "$$XPREFIX" >>$@
+	@printf 'MANDIR := %s\n' "$$XMANDIR" >>$@
+	@printf 'OS := %s\n' "$${OS:-$$(uname)}" >>$@
+	@printf 'CC := %s\n' "$$XCC" >>$@
+	@printf 'INSTALL := %s\n' "$$XINSTALL" >>$@
+	@printf 'MKDIR := %s\n' "$$XMKDIR" >>$@
+	@printf 'PKG_CONFIG := %s\n' "$$XPKG_CONFIG" >>$@
+	@printf 'RM := %s\n' "$$XRM" >>$@
+	${VCAT} $@
+
+# Sets the build flags.  This depends on vars.mk and uses a recursive make so
+# that the default flags can depend on variables like ${OS}.
+gen/flags.mk: gen/vars.mk
+	@+${MAKE} -sf build/flags.mk $@
+.PHONY: gen/flags.mk
+
+# Check for dependency generation support
+gen/deps.mk: gen/flags.mk
+	@+${MAKE} -sf build/deps.mk $@
+.PHONY: gen/deps.mk
+
+# Auto-detect dependencies and their build flags
+gen/pkgs.mk: gen/flags.mk
+	@+${MAKE} -sf build/pkgs.mk $@
+.PHONY: gen/pkgs.mk
+
+# Compile-time feature detection
+gen/config.h: gen/config.mk
+	@+${MAKE} -sf build/header.mk $@
+.PHONY: gen/config.h
diff --git a/build/define-if.sh b/build/define-if.sh
new file mode 100755
index 0000000..295ead8
--- /dev/null
+++ b/build/define-if.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Output a C preprocessor definition based on whether a command succeeds
+
+set -eu
+
+SLUG="${1#build/}"
+SLUG="${SLUG%.c}"
+MACRO="BFS_$(printf '%s' "$SLUG" | tr '/a-z-' '_A-Z_')"
+shift
+
+if "$@"; then
+    printf '#define %s true\n' "$MACRO"
+else
+    printf '#define %s false\n' "$MACRO"
+    exit 1
+fi
diff --git a/build/deps.mk b/build/deps.mk
new file mode 100644
index 0000000..e8dd9fb
--- /dev/null
+++ b/build/deps.mk
@@ -0,0 +1,18 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Makefile that generates gen/deps.mk
+
+include build/prelude.mk
+include gen/vars.mk
+include gen/flags.mk
+include build/exports.mk
+
+gen/deps.mk::
+	${MSG} "[ GEN] $@"
+	printf '# %s\n' "$@" >$@
+	if build/cc.sh -MD -MP -MF /dev/null build/empty.c; then \
+	    printf 'DEPFLAGS := -MD -MP\n'; \
+	fi >>$@ 2>$@.log
+	${VCAT} $@
+	printf -- '-include %s\n' ${OBJS:.o=.d} >>$@
diff --git a/build/empty.c b/build/empty.c
new file mode 100644
index 0000000..4fa9a5b
--- /dev/null
+++ b/build/empty.c
@@ -0,0 +1,6 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+int main(void) {
+	return 0;
+}
diff --git a/build/exports.mk b/build/exports.mk
new file mode 100644
index 0000000..ed19134
--- /dev/null
+++ b/build/exports.mk
@@ -0,0 +1,20 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Makefile fragment that exports variables used by configuration scripts
+
+export XPREFIX=${PREFIX}
+export XMANDIR=${MANDIR}
+
+export XCC=${CC}
+export XINSTALL=${INSTALL}
+export XMKDIR=${MKDIR}
+export XPKG_CONFIG=${PKG_CONFIG}
+export XRM=${RM}
+
+export XCPPFLAGS=${CPPFLAGS}
+export XCFLAGS=${CFLAGS}
+export XLDFLAGS=${LDFLAGS}
+export XLDLIBS=${LDLIBS}
+
+export XNOLIBS=${NOLIBS}
diff --git a/build/flags.mk b/build/flags.mk
new file mode 100644
index 0000000..0a44e94
--- /dev/null
+++ b/build/flags.mk
@@ -0,0 +1,136 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Makefile that generates gen/flags.mk
+
+include build/prelude.mk
+include gen/vars.mk
+
+# Configurable flags
+CPPFLAGS ?=
+CFLAGS ?= \
+    -g \
+    -Wall \
+    -Wformat=2 \
+    -Werror=implicit \
+    -Wimplicit-fallthrough \
+    -Wmissing-declarations \
+    -Wshadow \
+    -Wsign-compare \
+    -Wstrict-prototypes
+LDFLAGS ?=
+LDLIBS ?=
+
+export XCPPFLAGS=${CPPFLAGS}
+export XCFLAGS=${CFLAGS}
+export XLDFLAGS=${LDFLAGS}
+export XLDLIBS=${LDLIBS}
+
+# Immutable flags
+export BFS_CPPFLAGS= \
+    -Isrc \
+    -Igen \
+    -D__EXTENSIONS__ \
+    -D_ATFILE_SOURCE \
+    -D_BSD_SOURCE \
+    -D_DARWIN_C_SOURCE \
+    -D_DEFAULT_SOURCE \
+    -D_GNU_SOURCE \
+    -D_POSIX_PTHREAD_SEMANTICS \
+    -D_FILE_OFFSET_BITS=64 \
+    -D_TIME_BITS=64
+export BFS_CFLAGS= -std=c17 -pthread
+
+# Platform-specific system libraries
+LDLIBS,DragonFly := -lposix1e
+LDLIBS,Linux := -lrt
+LDLIBS,NetBSD := -lutil
+LDLIBS,SunOS := -lsec -lsocket -lnsl
+export BFS_LDLIBS=${LDLIBS,${OS}}
+
+# Build profiles
+_ASAN := ${TRUTHY,${ASAN}}
+_LSAN := ${TRUTHY,${LSAN}}
+_MSAN := ${TRUTHY,${MSAN}}
+_TSAN := ${TRUTHY,${TSAN}}
+_UBSAN := ${TRUTHY,${UBSAN}}
+_GCOV := ${TRUTHY,${GCOV}}
+_LINT := ${TRUTHY,${LINT}}
+_RELEASE := ${TRUTHY,${RELEASE}}
+
+# https://github.com/google/sanitizers/issues/342
+TSAN_CPPFLAGS,y := -DBFS_USE_TARGET_CLONES=0
+export TSAN_CPPFLAGS=${TSAN_CPPFLAGS,${_TSAN}}
+
+ASAN_CFLAGS,y := -fsanitize=address
+LSAN_CFLAGS,y := -fsanitize=leak
+MSAN_CFLAGS,y := -fsanitize=memory -fsanitize-memory-track-origins
+TSAN_CFLAGS,y := -fsanitize=thread
+UBSAN_CFLAGS.y := -fsanitize=undefined
+
+export ASAN_CFLAGS=${ASAN_CFLAGS,${_ASAN}}
+export LSAN_CFLAGS=${LSAN_CFLAGS,${_LSAN}}
+export MSAN_CFLAGS=${MSAN_CFLAGS,${_MSAN}}
+export TSAN_CFLAGS=${TSAN_CFLAGS,${_TSAN}}
+export UBSAN_CFLAGS=${UBSAN_CFLAGS,${_UBSAN}}
+
+SAN_CFLAGS,y := -fno-sanitize-recover=all
+INSANE := ${NOT,${_ASAN}${_LSAN}${_MSAN}${_TSAN}${_UBSAN}}
+SAN := ${NOT,${INSANE}}
+export SAN_CFLAGS=${SAN_CFLAGS,${SAN}}
+
+# MSAN and TSAN both need all code to be instrumented
+YESLIBS := ${NOT,${_MSAN}${_TSAN}}
+NOLIBS ?= ${NOT,${YESLIBS}}
+export XNOLIBS=${NOLIBS}
+
+# gcov only intercepts fork()/exec() with -std=gnu*
+GCOV_CFLAGS,y := -std=gnu17 --coverage
+export GCOV_CFLAGS=${GCOV_CFLAGS,${_GCOV}}
+
+LINT_CPPFLAGS,y := -D_FORTIFY_SOURCE=3 -DBFS_LINT
+LINT_CFLAGS,y := -Werror -O2
+
+export LINT_CPPFLAGS=${LINT_CPPFLAGS,${_LINT}}
+export LINT_CFLAGS=${LINT_CFLAGS,${_LINT}}
+
+RELEASE_CPPFLAGS,y := -DNDEBUG
+RELEASE_CFLAGS,y := -O3 -flto=auto
+
+export RELEASE_CPPFLAGS=${RELEASE_CPPFLAGS,${_RELEASE}}
+export RELEASE_CFLAGS=${RELEASE_CFLAGS,${_RELEASE}}
+
+# Set a variable
+SETVAR = printf '%s := %s\n' >>$@
+
+# Append to a variable, if non-empty
+APPEND = append() { test -z "$$2" || printf '%s += %s\n' "$$1" "$$2" >>$@; }; append
+
+gen/flags.mk::
+	${MSG} "[ GEN] $@"
+	printf '# %s\n' "$@" >$@
+	${SETVAR} CPPFLAGS "$$BFS_CPPFLAGS"
+	${APPEND} CPPFLAGS "$$TSAN_CPPFLAGS"
+	${APPEND} CPPFLAGS "$$LINT_CPPFLAGS"
+	${APPEND} CPPFLAGS "$$RELEASE_CPPFLAGS"
+	${APPEND} CPPFLAGS "$$XCPPFLAGS"
+	${APPEND} CPPFLAGS "$$EXTRA_CPPFLAGS"
+	${SETVAR} CFLAGS "$$BFS_CFLAGS"
+	${APPEND} CFLAGS "$$ASAN_CFLAGS"
+	${APPEND} CFLAGS "$$LSAN_CFLAGS"
+	${APPEND} CFLAGS "$$MSAN_CFLAGS"
+	${APPEND} CFLAGS "$$TSAN_CFLAGS"
+	${APPEND} CFLAGS "$$UBSAN_CFLAGS"
+	${APPEND} CFLAGS "$$SAN_CFLAGS"
+	${APPEND} CFLAGS "$$GCOV_CFLAGS"
+	${APPEND} CFLAGS "$$LINT_CFLAGS"
+	${APPEND} CFLAGS "$$RELEASE_CFLAGS"
+	${APPEND} CFLAGS "$$XCFLAGS"
+	${APPEND} CFLAGS "$$EXTRA_CFLAGS"
+	${SETVAR} LDFLAGS "$$XLDFLAGS"
+	${SETVAR} LDLIBS "$$XLDLIBS"
+	${APPEND} LDLIBS "$$EXTRA_LDLIBS"
+	${APPEND} LDLIBS "$$BFS_LDLIBS"
+	${SETVAR} NOLIBS "$$XNOLIBS"
+	test "${OS}-${SAN}" != FreeBSD-y || printf 'POSTLINK = elfctl -e +noaslr $$@\n' >>$@
+	${VCAT} $@
diff --git a/build/has/acl-get-entry.c b/build/has/acl-get-entry.c
new file mode 100644
index 0000000..3cce771
--- /dev/null
+++ b/build/has/acl-get-entry.c
@@ -0,0 +1,8 @@
+#include 
+#include 
+
+int main(void) {
+	acl_t acl = acl_get_file(".", ACL_TYPE_DEFAULT);
+	acl_entry_t entry;
+	return acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
+}
diff --git a/build/has/acl-get-file.c b/build/has/acl-get-file.c
new file mode 100644
index 0000000..89fbf23
--- /dev/null
+++ b/build/has/acl-get-file.c
@@ -0,0 +1,8 @@
+#include 
+#include 
+#include 
+
+int main(void) {
+	acl_t acl = acl_get_file(".", ACL_TYPE_DEFAULT);
+	return acl == (acl_t)NULL;
+}
diff --git a/build/has/acl-get-tag-type.c b/build/has/acl-get-tag-type.c
new file mode 100644
index 0000000..2901956
--- /dev/null
+++ b/build/has/acl-get-tag-type.c
@@ -0,0 +1,10 @@
+#include 
+#include 
+#include 
+
+int main(void) {
+	acl_entry_t entry;
+	memset(&entry, 0, sizeof(entry));
+	acl_tag_t tag;
+	return acl_get_tag_type(entry, &tag);
+}
diff --git a/build/has/acl-is-trivial-np.c b/build/has/acl-is-trivial-np.c
new file mode 100644
index 0000000..9ca9fc7
--- /dev/null
+++ b/build/has/acl-is-trivial-np.c
@@ -0,0 +1,12 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+
+int main(void) {
+	acl_t acl = acl_get_fd(3);
+	int trivial;
+	acl_is_trivial_np(acl, &trivial);
+	return 0;
+}
diff --git a/build/has/acl-trivial.c b/build/has/acl-trivial.c
new file mode 100644
index 0000000..7efc838
--- /dev/null
+++ b/build/has/acl-trivial.c
@@ -0,0 +1,8 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	return acl_trivial(".");
+}
diff --git a/build/has/aligned-alloc.c b/build/has/aligned-alloc.c
new file mode 100644
index 0000000..4460038
--- /dev/null
+++ b/build/has/aligned-alloc.c
@@ -0,0 +1,8 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	return !aligned_alloc(_Alignof(void *), sizeof(void *));
+}
diff --git a/build/has/confstr.c b/build/has/confstr.c
new file mode 100644
index 0000000..58280b4
--- /dev/null
+++ b/build/has/confstr.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	confstr(_CS_PATH, NULL, 0);
+	return 0;
+}
diff --git a/build/has/extattr-get-file.c b/build/has/extattr-get-file.c
new file mode 100644
index 0000000..ac9cf96
--- /dev/null
+++ b/build/has/extattr-get-file.c
@@ -0,0 +1,10 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+#include 
+
+int main(void) {
+	return extattr_get_file("file", EXTATTR_NAMESPACE_USER, "xattr", NULL, 0);
+}
diff --git a/build/has/extattr-get-link.c b/build/has/extattr-get-link.c
new file mode 100644
index 0000000..c35be5b
--- /dev/null
+++ b/build/has/extattr-get-link.c
@@ -0,0 +1,10 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+#include 
+
+int main(void) {
+	return extattr_get_link("link", EXTATTR_NAMESPACE_USER, "xattr", NULL, 0);
+}
diff --git a/build/has/extattr-list-file.c b/build/has/extattr-list-file.c
new file mode 100644
index 0000000..e68a8bb
--- /dev/null
+++ b/build/has/extattr-list-file.c
@@ -0,0 +1,10 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+#include 
+
+int main(void) {
+	return extattr_list_file("file", EXTATTR_NAMESPACE_USER, NULL, 0);
+}
diff --git a/build/has/extattr-list-link.c b/build/has/extattr-list-link.c
new file mode 100644
index 0000000..49f0ec2
--- /dev/null
+++ b/build/has/extattr-list-link.c
@@ -0,0 +1,10 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+#include 
+
+int main(void) {
+	return extattr_list_link("link", EXTATTR_NAMESPACE_USER, NULL, 0);
+}
diff --git a/build/has/fdclosedir.c b/build/has/fdclosedir.c
new file mode 100644
index 0000000..f4ad1f5
--- /dev/null
+++ b/build/has/fdclosedir.c
@@ -0,0 +1,8 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	return fdclosedir(opendir("."));
+}
diff --git a/build/has/getdents.c b/build/has/getdents.c
new file mode 100644
index 0000000..d0d4228
--- /dev/null
+++ b/build/has/getdents.c
@@ -0,0 +1,10 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct dirent de;
+	getdents(3, &de, 1024);
+	return 0;
+}
diff --git a/build/has/getdents64-syscall.c b/build/has/getdents64-syscall.c
new file mode 100644
index 0000000..4838c14
--- /dev/null
+++ b/build/has/getdents64-syscall.c
@@ -0,0 +1,12 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+#include 
+
+int main(void) {
+	struct dirent64 de;
+	syscall(SYS_getdents64, 3, &de, 1024);
+	return 0;
+}
diff --git a/build/has/getdents64.c b/build/has/getdents64.c
new file mode 100644
index 0000000..1abf36d
--- /dev/null
+++ b/build/has/getdents64.c
@@ -0,0 +1,10 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct dirent64 de;
+	getdents64(3, &de, 1024);
+	return 0;
+}
diff --git a/build/has/getprogname-gnu.c b/build/has/getprogname-gnu.c
new file mode 100644
index 0000000..6b97c5e
--- /dev/null
+++ b/build/has/getprogname-gnu.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	const char *str = program_invocation_short_name;
+	return str[0];
+}
diff --git a/build/has/getprogname.c b/build/has/getprogname.c
new file mode 100644
index 0000000..83dc8e8
--- /dev/null
+++ b/build/has/getprogname.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	const char *str = getprogname();
+	return str[0];
+}
diff --git a/build/has/max-align-t.c b/build/has/max-align-t.c
new file mode 100644
index 0000000..96165ce
--- /dev/null
+++ b/build/has/max-align-t.c
@@ -0,0 +1,8 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	return _Alignof(max_align_t);
+}
diff --git a/build/has/pipe2.c b/build/has/pipe2.c
new file mode 100644
index 0000000..4cb43b5
--- /dev/null
+++ b/build/has/pipe2.c
@@ -0,0 +1,10 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+
+int main(void) {
+	int fds[2];
+	return pipe2(fds, O_CLOEXEC);
+}
diff --git a/build/has/posix-spawn-addfchdir-np.c b/build/has/posix-spawn-addfchdir-np.c
new file mode 100644
index 0000000..b870a53
--- /dev/null
+++ b/build/has/posix-spawn-addfchdir-np.c
@@ -0,0 +1,11 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	posix_spawn_file_actions_t actions;
+	posix_spawn_file_actions_init(&actions);
+	posix_spawn_file_actions_addfchdir_np(&actions, 3);
+	return 0;
+}
diff --git a/build/has/posix-spawn-addfchdir.c b/build/has/posix-spawn-addfchdir.c
new file mode 100644
index 0000000..c52ff81
--- /dev/null
+++ b/build/has/posix-spawn-addfchdir.c
@@ -0,0 +1,11 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	posix_spawn_file_actions_t actions;
+	posix_spawn_file_actions_init(&actions);
+	posix_spawn_file_actions_addfchdir(&actions, 3);
+	return 0;
+}
diff --git a/build/has/st-acmtim.c b/build/has/st-acmtim.c
new file mode 100644
index 0000000..d687ab0
--- /dev/null
+++ b/build/has/st-acmtim.c
@@ -0,0 +1,12 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct stat sb = {0};
+	unsigned int a = sb.st_atim.tv_sec;
+	unsigned int c = sb.st_ctim.tv_sec;
+	unsigned int m = sb.st_mtim.tv_sec;
+	return a + c + m;
+}
diff --git a/build/has/st-acmtimespec.c b/build/has/st-acmtimespec.c
new file mode 100644
index 0000000..f747bc0
--- /dev/null
+++ b/build/has/st-acmtimespec.c
@@ -0,0 +1,12 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct stat sb = {0};
+	unsigned int a = sb.st_atimespec.tv_sec;
+	unsigned int c = sb.st_ctimespec.tv_sec;
+	unsigned int m = sb.st_mtimespec.tv_sec;
+	return a + c + m;
+}
diff --git a/build/has/st-birthtim.c b/build/has/st-birthtim.c
new file mode 100644
index 0000000..4964571
--- /dev/null
+++ b/build/has/st-birthtim.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct stat sb = {0};
+	return sb.st_birthtim.tv_sec;
+}
diff --git a/build/has/st-birthtimespec.c b/build/has/st-birthtimespec.c
new file mode 100644
index 0000000..91a613f
--- /dev/null
+++ b/build/has/st-birthtimespec.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct stat sb = {0};
+	return sb.st_birthtimespec.tv_sec;
+}
diff --git a/build/has/st-flags.c b/build/has/st-flags.c
new file mode 100644
index 0000000..b1d0c32
--- /dev/null
+++ b/build/has/st-flags.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct stat sb = {0};
+	return sb.st_flags;
+}
diff --git a/build/has/statx-syscall.c b/build/has/statx-syscall.c
new file mode 100644
index 0000000..87ec869
--- /dev/null
+++ b/build/has/statx-syscall.c
@@ -0,0 +1,13 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+#include 
+#include 
+
+int main(void) {
+	struct statx sb;
+	syscall(SYS_statx, AT_FDCWD, ".", 0, STATX_BASIC_STATS, &sb);
+	return 0;
+}
diff --git a/build/has/statx.c b/build/has/statx.c
new file mode 100644
index 0000000..65f1674
--- /dev/null
+++ b/build/has/statx.c
@@ -0,0 +1,11 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+
+int main(void) {
+	struct statx sb;
+	statx(AT_FDCWD, ".", 0, STATX_BASIC_STATS, &sb);
+	return 0;
+}
diff --git a/build/has/strerror-l.c b/build/has/strerror-l.c
new file mode 100644
index 0000000..3dcc4d7
--- /dev/null
+++ b/build/has/strerror-l.c
@@ -0,0 +1,11 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+#include 
+
+int main(void) {
+	locale_t locale = duplocale(LC_GLOBAL_LOCALE);
+	return !strerror_l(ENOMEM, locale);
+}
diff --git a/build/has/strerror-r-gnu.c b/build/has/strerror-r-gnu.c
new file mode 100644
index 0000000..26ca0ee
--- /dev/null
+++ b/build/has/strerror-r-gnu.c
@@ -0,0 +1,11 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+
+int main(void) {
+	char buf[256];
+	// Check that strerror_r() returns a pointer
+	return *strerror_r(ENOMEM, buf, sizeof(buf));
+}
diff --git a/build/has/strerror-r-posix.c b/build/has/strerror-r-posix.c
new file mode 100644
index 0000000..41b2d30
--- /dev/null
+++ b/build/has/strerror-r-posix.c
@@ -0,0 +1,11 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+#include 
+
+int main(void) {
+	char buf[256];
+	// Check that strerror_r() returns an integer
+	return 2 * strerror_r(ENOMEM, buf, sizeof(buf));
+}
diff --git a/build/has/tm-gmtoff.c b/build/has/tm-gmtoff.c
new file mode 100644
index 0000000..543df48
--- /dev/null
+++ b/build/has/tm-gmtoff.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	struct tm tm = {0};
+	return tm.tm_gmtoff;
+}
diff --git a/build/has/uselocale.c b/build/has/uselocale.c
new file mode 100644
index 0000000..a712ff8
--- /dev/null
+++ b/build/has/uselocale.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	locale_t locale = uselocale((locale_t)0);
+	return locale == LC_GLOBAL_LOCALE;
+}
diff --git a/build/header.mk b/build/header.mk
new file mode 100644
index 0000000..3f77ca5
--- /dev/null
+++ b/build/header.mk
@@ -0,0 +1,69 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Makefile that generates gen/config.h
+
+include build/prelude.mk
+include gen/config.mk
+include build/exports.mk
+
+# All header fragments we generate
+HEADERS := \
+    gen/has/acl-get-entry.h \
+    gen/has/acl-get-file.h \
+    gen/has/acl-get-tag-type.h \
+    gen/has/acl-is-trivial-np.h \
+    gen/has/acl-trivial.h \
+    gen/has/aligned-alloc.h \
+    gen/has/confstr.h \
+    gen/has/extattr-get-file.h \
+    gen/has/extattr-get-link.h \
+    gen/has/extattr-list-file.h \
+    gen/has/extattr-list-link.h \
+    gen/has/fdclosedir.h \
+    gen/has/getdents.h \
+    gen/has/getdents64.h \
+    gen/has/getdents64-syscall.h \
+    gen/has/getprogname.h \
+    gen/has/getprogname-gnu.h \
+    gen/has/max-align-t.h \
+    gen/has/pipe2.h \
+    gen/has/posix-spawn-addfchdir.h \
+    gen/has/posix-spawn-addfchdir-np.h \
+    gen/has/st-acmtim.h \
+    gen/has/st-acmtimespec.h \
+    gen/has/st-birthtim.h \
+    gen/has/st-birthtimespec.h \
+    gen/has/st-flags.h \
+    gen/has/statx.h \
+    gen/has/statx-syscall.h \
+    gen/has/strerror-l.h \
+    gen/has/strerror-r-gnu.h \
+    gen/has/strerror-r-posix.h \
+    gen/has/tm-gmtoff.h \
+    gen/has/uselocale.h
+
+# Previously generated by pkgs.mk
+PKG_HEADERS := ${ALL_PKGS:%=gen/use/%.h}
+
+gen/config.h: ${PKG_HEADERS} ${HEADERS}
+	${MSG} "[ GEN] $@"
+	printf '// %s\n' "$@" >$@
+	printf '#ifndef BFS_CONFIG_H\n' >>$@
+	printf '#define BFS_CONFIG_H\n' >>$@
+	cat ${.ALLSRC} >>$@
+	printf '#endif // BFS_CONFIG_H\n' >>$@
+	cat ${.ALLSRC:%=%.log} >$@.log
+	${VCAT} $@
+.PHONY: gen/config.h
+
+# The short name of the config test
+SLUG = ${@:gen/%.h=%}
+
+${HEADERS}::
+	${MKDIR} ${@D}
+	if build/define-if.sh ${SLUG} build/cc.sh build/${SLUG}.c >$@ 2>$@.log; then \
+	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✔\n' ${SLUG}.c; \
+	else \
+	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✘\n' ${SLUG}.c; \
+	fi
diff --git a/build/pkgconf.sh b/build/pkgconf.sh
new file mode 100755
index 0000000..96e4bf1
--- /dev/null
+++ b/build/pkgconf.sh
@@ -0,0 +1,100 @@
+#!/bin/sh
+
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# pkg-config wrapper with hardcoded fallbacks
+
+set -eu
+
+MODE=
+case "${1:-}" in
+    --*)
+        MODE="$1"
+        shift
+esac
+
+if [ $# -lt 1 ]; then
+    exit
+fi
+
+case "$XNOLIBS" in
+    y|1)
+        exit 1
+esac
+
+if [ -z "$MODE" ]; then
+    # Check whether the libraries exist at all
+    for LIB; do
+        # Check ${USE_$LIB}
+        USE_LIB="USE_$(printf '%s' "$LIB" | tr 'a-z-' 'A-Z_')"
+        eval "USE=\"\${$USE_LIB:-}\""
+        case "$USE" in
+            y|1)
+                continue
+                ;;
+            n|0)
+                exit 1
+                ;;
+        esac
+
+        CFLAGS=$("$0" --cflags "$LIB") || exit 1
+        LDFLAGS=$("$0" --ldflags "$LIB") || exit 1
+        LDLIBS=$("$0" --ldlibs "$LIB") || exit 1
+        build/cc.sh $CFLAGS $LDFLAGS build/use/$LIB.c $LDLIBS || exit 1
+    done
+fi
+
+# Defer to pkg-config if possible
+if command -v "${XPKG_CONFIG:-}" >/dev/null 2>&1; then
+    case "$MODE" in
+        --cflags)
+            "$XPKG_CONFIG" --cflags "$@"
+            ;;
+        --ldflags)
+            "$XPKG_CONFIG" --libs-only-L --libs-only-other "$@"
+            ;;
+        --ldlibs)
+            "$XPKG_CONFIG" --libs-only-l "$@"
+            ;;
+    esac
+
+    exit
+fi
+
+# pkg-config unavailable, emulate it ourselves
+CFLAGS=""
+LDFLAGS=""
+LDLIBS=""
+
+for LIB; do
+    case "$LIB" in
+        libacl)
+            LDLIB=-lacl
+            ;;
+        libcap)
+            LDLIB=-lcap
+            ;;
+        libselinux)
+            LDLIB=-lselinux
+            ;;
+        liburing)
+            LDLIB=-luring
+            ;;
+        oniguruma)
+            LDLIB=-lonig
+            ;;
+        *)
+            printf 'error: Unknown package %s\n' "$LIB" >&2
+            exit 1
+            ;;
+    esac
+
+    LDLIBS="$LDLIBS$LDLIB "
+done
+
+case "$MODE" in
+    --ldlibs)
+        printf '%s\n' "$LDLIBS"
+    ;;
+esac
diff --git a/build/pkgs.mk b/build/pkgs.mk
new file mode 100644
index 0000000..51ca664
--- /dev/null
+++ b/build/pkgs.mk
@@ -0,0 +1,36 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Makefile that generates gen/pkgs.mk
+
+include build/prelude.mk
+include gen/vars.mk
+include gen/flags.mk
+include build/exports.mk
+
+HEADERS := ${ALL_PKGS:%=gen/use/%.h}
+
+gen/pkgs.mk: ${HEADERS}
+	${MSG} "[ GEN] $@"
+	printf '# %s\n' "$@" >$@
+	gen() { \
+	    printf 'PKGS := %s\n' "$$*"; \
+	    printf 'CFLAGS += %s\n' "$$(build/pkgconf.sh --cflags "$$@")"; \
+	    printf 'LDFLAGS += %s\n' "$$(build/pkgconf.sh --ldflags "$$@")"; \
+	    printf 'LDLIBS := %s $${LDLIBS}\n' "$$(build/pkgconf.sh --ldlibs "$$@")"; \
+	}; \
+	gen $$(grep -l ' true$$' ${.ALLSRC} | sed 's|.*/\(.*\)\.h|\1|') >>$@
+	${VCAT} $@
+
+.PHONY: gen/pkgs.mk
+
+# Convert gen/use/foo.h to foo
+PKG = ${@:gen/use/%.h=%}
+
+${HEADERS}::
+	${MKDIR} ${@D}
+	if build/define-if.sh use/${PKG} build/pkgconf.sh ${PKG} >$@ 2>$@.log; then \
+	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✔\n' use/${PKG}.c; \
+	else \
+	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✘\n' use/${PKG}.c; \
+	fi
diff --git a/build/prelude.mk b/build/prelude.mk
new file mode 100644
index 0000000..b235fa9
--- /dev/null
+++ b/build/prelude.mk
@@ -0,0 +1,133 @@
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# Common makefile utilities.  Compatible with both GNU make and most BSD makes.
+
+# BSD make will chdir into ${.OBJDIR} by default, unless we tell it not to
+.OBJDIR: .
+
+# We don't use any suffix rules
+.SUFFIXES:
+
+# GNU make has $^ for the full list of targets, while BSD make has $> and the
+# long-form ${.ALLSRC}.  We could write $^ $> to get them both, but that would
+# break if one of them implemented support for the other.  So instead, bring
+# BSD's ${.ALLSRC} to GNU.
+.ALLSRC ?= $^
+
+# Installation paths
+DESTDIR ?=
+PREFIX ?= /usr
+MANDIR ?= ${PREFIX}/share/man
+
+# Configurable executables
+CC ?= cc
+INSTALL ?= install
+MKDIR ?= mkdir -p
+PKG_CONFIG ?= pkg-config
+RM ?= rm -f
+
+# GNU and BSD make have incompatible syntax for conditionals, but we can do a
+# lot with just nested variable expansion.  We use "y" as the canonical
+# truthy value, and "" (the empty string) as the canonical falsey value.
+#
+# To normalize a boolean, use ${TRUTHY,${VAR}}, which expands like this:
+#
+#     VAR=y      ${TRUTHY,${VAR}} => ${TRUTHY,y}     => y
+#     VAR=1      ${TRUTHY,${VAR}} => ${TRUTHY,1}     => y
+#     VAR=n      ${TRUTHY,${VAR}} => ${TRUTHY,n}     =>   [empty]
+#     VAR=other  ${TRUTHY,${VAR}} => ${TRUTHY,other} =>   [empty]
+#     VAR=       ${TRUTHY,${VAR}} => ${TRUTHY,}      =>   [emtpy]
+#
+# Inspired by https://github.com/wahern/autoguess
+TRUTHY,y := y
+TRUTHY,1 := y
+
+# Boolean operators are also implemented with nested expansion
+NOT,  := y
+
+# Normalize ${V} to either "y" or ""
+IS_V := ${TRUTHY,${V}}
+
+# Suppress output unless V=1
+Q, := @
+Q  := ${Q,${IS_V}}
+
+# Show full commands with `make V=1`, otherwise short summaries
+MSG = @msg() { \
+          MSG="$$1"; \
+          shift; \
+          test "${IS_V}" || printf '%s\n' "$$MSG"; \
+          test "$${1:-}" || return 0; \
+          test "${IS_V}" && printf '%s\n' "$$*"; \
+          "$$@"; \
+      }; \
+      msg
+
+# Maximum width of a short message, to align the ✔/✘
+MSG_WIDTH := 30
+
+# cat a file if V=1
+VCAT,y := @cat
+VCAT,  := @:
+VCAT   := ${VCAT,${IS_V}}
+
+# All external dependencies
+ALL_PKGS := \
+    libacl \
+    libcap \
+    libselinux \
+    liburing \
+    oniguruma
+
+# List all object files here, as they're needed by both `./configure` and `make`
+
+# All object files except the entry point
+LIBBFS := \
+    obj/src/alloc.o \
+    obj/src/bar.o \
+    obj/src/bfstd.o \
+    obj/src/bftw.o \
+    obj/src/color.o \
+    obj/src/ctx.o \
+    obj/src/diag.o \
+    obj/src/dir.o \
+    obj/src/dstring.o \
+    obj/src/eval.o \
+    obj/src/exec.o \
+    obj/src/expr.o \
+    obj/src/fsade.o \
+    obj/src/ioq.o \
+    obj/src/mtab.o \
+    obj/src/opt.o \
+    obj/src/parse.o \
+    obj/src/printf.o \
+    obj/src/pwcache.o \
+    obj/src/stat.o \
+    obj/src/thread.o \
+    obj/src/trie.o \
+    obj/src/typo.o \
+    obj/src/xregex.o \
+    obj/src/xspawn.o \
+    obj/src/xtime.o \
+    obj/gen/version.o
+
+# Unit test objects
+UNIT_OBJS := \
+    obj/tests/alloc.o \
+    obj/tests/bfstd.o \
+    obj/tests/bit.o \
+    obj/tests/ioq.o \
+    obj/tests/main.o \
+    obj/tests/trie.o \
+    obj/tests/xspawn.o \
+    obj/tests/xtime.o
+
+# All object files
+OBJS := \
+    obj/src/main.o \
+    obj/tests/mksock.o \
+    obj/tests/xspawnee.o \
+    obj/tests/xtouch.o \
+    ${LIBBFS} \
+    ${UNIT_OBJS}
diff --git a/build/use/libacl.c b/build/use/libacl.c
new file mode 100644
index 0000000..de1fe50
--- /dev/null
+++ b/build/use/libacl.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	acl_free(0);
+	return 0;
+}
diff --git a/build/use/libcap.c b/build/use/libcap.c
new file mode 100644
index 0000000..58e832c
--- /dev/null
+++ b/build/use/libcap.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	cap_free(0);
+	return 0;
+}
diff --git a/build/use/libselinux.c b/build/use/libselinux.c
new file mode 100644
index 0000000..bca409d
--- /dev/null
+++ b/build/use/libselinux.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	freecon(0);
+	return 0;
+}
diff --git a/build/use/liburing.c b/build/use/liburing.c
new file mode 100644
index 0000000..bea499a
--- /dev/null
+++ b/build/use/liburing.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	io_uring_free_probe(0);
+	return 0;
+}
diff --git a/build/use/oniguruma.c b/build/use/oniguruma.c
new file mode 100644
index 0000000..cb17596
--- /dev/null
+++ b/build/use/oniguruma.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes 
+// SPDX-License-Identifier: 0BSD
+
+#include 
+
+int main(void) {
+	onig_free(0);
+	return 0;
+}
diff --git a/config/cc.sh b/config/cc.sh
deleted file mode 100755
index 45d51ca..0000000
--- a/config/cc.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Run the compiler and check if it succeeded
-
-set -eu
-
-TMP=$(mktemp)
-trap 'rm -f "$TMP"' EXIT
-
-(
-    set -x
-    $XCC $XCPPFLAGS $XCFLAGS $XLDFLAGS "$@" $XLDLIBS -o "$TMP"
-)
diff --git a/config/config.mk b/config/config.mk
deleted file mode 100644
index 280c6ac..0000000
--- a/config/config.mk
+++ /dev/null
@@ -1,63 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Makefile fragment that implements `make config`
-
-include config/prelude.mk
-include config/exports.mk
-
-# All configuration steps
-config: ${CONFIG} ${GEN}/config.h
-.PHONY: config
-
-# Makefile fragments generated by `make config`
-MKS := \
-    ${GEN}/vars.mk \
-    ${GEN}/flags.mk \
-    ${GEN}/deps.mk \
-    ${GEN}/pkgs.mk
-
-# The main configuration file, which includes the others
-${CONFIG}: ${MKS}
-	${MSG} "[ GEN] ${TGT}"
-	@printf '# %s\n' "${TGT}" >$@
-	@printf 'include $${GEN}/%s\n' ${MKS:${GEN}/%=%} >>$@
-	${VCAT} ${CONFIG}
-.PHONY: ${CONFIG}
-
-# Saves the configurable variables
-${GEN}/vars.mk::
-	@${MKDIR} ${@D}
-	${MSG} "[ GEN] ${TGT}"
-	@printf '# %s\n' "${TGT}" >$@
-	@printf 'PREFIX := %s\n' "$$XPREFIX" >>$@
-	@printf 'MANDIR := %s\n' "$$XMANDIR" >>$@
-	@printf 'OS := %s\n' "$${OS:-$$(uname)}" >>$@
-	@printf 'CC := %s\n' "$$XCC" >>$@
-	@printf 'INSTALL := %s\n' "$$XINSTALL" >>$@
-	@printf 'MKDIR := %s\n' "$$XMKDIR" >>$@
-	@printf 'PKG_CONFIG := %s\n' "$$XPKG_CONFIG" >>$@
-	@printf 'RM := %s\n' "$$XRM" >>$@
-	@printf 'PKGS :=\n' >>$@
-	${VCAT} $@
-
-# Sets the build flags.  This depends on vars.mk and uses a recursive make so
-# that the default flags can depend on variables like ${OS}.
-${GEN}/flags.mk: ${GEN}/vars.mk
-	@+${MAKE} -sf config/flags.mk $@
-.PHONY: ${GEN}/flags.mk
-
-# Check for dependency generation support
-${GEN}/deps.mk: ${GEN}/flags.mk
-	@+${MAKE} -sf config/deps.mk $@
-.PHONY: ${GEN}/deps.mk
-
-# Auto-detect dependencies and their build flags
-${GEN}/pkgs.mk: ${GEN}/flags.mk
-	@+${MAKE} -sf config/pkgs.mk $@
-.PHONY: ${GEN}/pkgs.mk
-
-# Compile-time feature detection
-${GEN}/config.h: ${CONFIG}
-	@+${MAKE} -sf config/header.mk $@
-.PHONY: ${GEN}/config.h
diff --git a/config/define-if.sh b/config/define-if.sh
deleted file mode 100755
index 059c1ac..0000000
--- a/config/define-if.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/sh
-
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Output a C preprocessor definition based on whether a command succeeds
-
-set -eu
-
-SLUG="${1#config/}"
-SLUG="${SLUG%.c}"
-MACRO="BFS_$(printf '%s' "$SLUG" | tr '/a-z-' '_A-Z_')"
-shift
-
-if "$@"; then
-    printf '#define %s true\n' "$MACRO"
-else
-    printf '#define %s false\n' "$MACRO"
-    exit 1
-fi
diff --git a/config/deps.mk b/config/deps.mk
deleted file mode 100644
index ac394a5..0000000
--- a/config/deps.mk
+++ /dev/null
@@ -1,18 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Makefile that generates gen/deps.mk
-
-include config/prelude.mk
-include ${GEN}/vars.mk
-include ${GEN}/flags.mk
-include config/exports.mk
-
-${GEN}/deps.mk::
-	${MSG} "[ GEN] ${TGT}"
-	printf '# %s\n' "${TGT}" >$@
-	if config/cc.sh -MD -MP -MF /dev/null config/empty.c; then \
-	    printf 'DEPFLAGS = -MD -MP\n'; \
-	fi >>$@ 2>$@.log
-	${VCAT} $@
-	printf -- '-include %s\n' ${OBJS:.o=.d} >>$@
diff --git a/config/empty.c b/config/empty.c
deleted file mode 100644
index 4fa9a5b..0000000
--- a/config/empty.c
+++ /dev/null
@@ -1,6 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-int main(void) {
-	return 0;
-}
diff --git a/config/exports.mk b/config/exports.mk
deleted file mode 100644
index ed19134..0000000
--- a/config/exports.mk
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Makefile fragment that exports variables used by configuration scripts
-
-export XPREFIX=${PREFIX}
-export XMANDIR=${MANDIR}
-
-export XCC=${CC}
-export XINSTALL=${INSTALL}
-export XMKDIR=${MKDIR}
-export XPKG_CONFIG=${PKG_CONFIG}
-export XRM=${RM}
-
-export XCPPFLAGS=${CPPFLAGS}
-export XCFLAGS=${CFLAGS}
-export XLDFLAGS=${LDFLAGS}
-export XLDLIBS=${LDLIBS}
-
-export XNOLIBS=${NOLIBS}
diff --git a/config/flags.mk b/config/flags.mk
deleted file mode 100644
index 837c30f..0000000
--- a/config/flags.mk
+++ /dev/null
@@ -1,136 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Makefile that generates gen/flags.mk
-
-include config/prelude.mk
-include ${GEN}/vars.mk
-
-# Configurable flags
-CPPFLAGS ?=
-CFLAGS ?= \
-    -g \
-    -Wall \
-    -Wformat=2 \
-    -Werror=implicit \
-    -Wimplicit-fallthrough \
-    -Wmissing-declarations \
-    -Wshadow \
-    -Wsign-compare \
-    -Wstrict-prototypes
-LDFLAGS ?=
-LDLIBS ?=
-
-export XCPPFLAGS=${CPPFLAGS}
-export XCFLAGS=${CFLAGS}
-export XLDFLAGS=${LDFLAGS}
-export XLDLIBS=${LDLIBS}
-
-# Immutable flags
-export BFS_CPPFLAGS= \
-    -Isrc \
-    -I${GEN} \
-    -D__EXTENSIONS__ \
-    -D_ATFILE_SOURCE \
-    -D_BSD_SOURCE \
-    -D_DARWIN_C_SOURCE \
-    -D_DEFAULT_SOURCE \
-    -D_GNU_SOURCE \
-    -D_POSIX_PTHREAD_SEMANTICS \
-    -D_FILE_OFFSET_BITS=64 \
-    -D_TIME_BITS=64
-export BFS_CFLAGS= -std=c17 -pthread
-
-# Platform-specific system libraries
-LDLIBS,DragonFly := -lposix1e
-LDLIBS,Linux := -lrt
-LDLIBS,NetBSD := -lutil
-LDLIBS,SunOS := -lsec -lsocket -lnsl
-export BFS_LDLIBS=${LDLIBS,${OS}}
-
-# Build profiles
-_ASAN := ${TRUTHY,${ASAN}}
-_LSAN := ${TRUTHY,${LSAN}}
-_MSAN := ${TRUTHY,${MSAN}}
-_TSAN := ${TRUTHY,${TSAN}}
-_UBSAN := ${TRUTHY,${UBSAN}}
-_GCOV := ${TRUTHY,${GCOV}}
-_LINT := ${TRUTHY,${LINT}}
-_RELEASE := ${TRUTHY,${RELEASE}}
-
-# https://github.com/google/sanitizers/issues/342
-TSAN_CPPFLAGS,y := -DBFS_USE_TARGET_CLONES=0
-export TSAN_CPPFLAGS=${TSAN_CPPFLAGS,${_TSAN}}
-
-ASAN_CFLAGS,y := -fsanitize=address
-LSAN_CFLAGS,y := -fsanitize=leak
-MSAN_CFLAGS,y := -fsanitize=memory -fsanitize-memory-track-origins
-TSAN_CFLAGS,y := -fsanitize=thread
-UBSAN_CFLAGS.y := -fsanitize=undefined
-
-export ASAN_CFLAGS=${ASAN_CFLAGS,${_ASAN}}
-export LSAN_CFLAGS=${LSAN_CFLAGS,${_LSAN}}
-export MSAN_CFLAGS=${MSAN_CFLAGS,${_MSAN}}
-export TSAN_CFLAGS=${TSAN_CFLAGS,${_TSAN}}
-export UBSAN_CFLAGS=${UBSAN_CFLAGS,${_UBSAN}}
-
-SAN_CFLAGS,y := -fno-sanitize-recover=all
-INSANE := ${NOT,${_ASAN}${_LSAN}${_MSAN}${_TSAN}${_UBSAN}}
-SAN := ${NOT,${INSANE}}
-export SAN_CFLAGS=${SAN_CFLAGS,${SAN}}
-
-# MSAN and TSAN both need all code to be instrumented
-YESLIBS := ${NOT,${_MSAN}${_TSAN}}
-NOLIBS ?= ${NOT,${YESLIBS}}
-export XNOLIBS=${NOLIBS}
-
-# gcov only intercepts fork()/exec() with -std=gnu*
-GCOV_CFLAGS,y := -std=gnu17 --coverage
-export GCOV_CFLAGS=${GCOV_CFLAGS,${_GCOV}}
-
-LINT_CPPFLAGS,y := -D_FORTIFY_SOURCE=3 -DBFS_LINT
-LINT_CFLAGS,y := -Werror -O2
-
-export LINT_CPPFLAGS=${LINT_CPPFLAGS,${_LINT}}
-export LINT_CFLAGS=${LINT_CFLAGS,${_LINT}}
-
-RELEASE_CPPFLAGS,y := -DNDEBUG
-RELEASE_CFLAGS,y := -O3 -flto=auto
-
-export RELEASE_CPPFLAGS=${RELEASE_CPPFLAGS,${_RELEASE}}
-export RELEASE_CFLAGS=${RELEASE_CFLAGS,${_RELEASE}}
-
-# Set a variable
-SETVAR = printf '%s := %s\n' >>$@
-
-# Append to a variable, if non-empty
-APPEND = append() { test -z "$$2" || printf '%s += %s\n' "$$1" "$$2" >>$@; }; append
-
-${GEN}/flags.mk::
-	${MSG} "[ GEN] ${TGT}"
-	printf '# %s\n' "${TGT}" >$@
-	${SETVAR} CPPFLAGS "$$BFS_CPPFLAGS"
-	${APPEND} CPPFLAGS "$$TSAN_CPPFLAGS"
-	${APPEND} CPPFLAGS "$$LINT_CPPFLAGS"
-	${APPEND} CPPFLAGS "$$RELEASE_CPPFLAGS"
-	${APPEND} CPPFLAGS "$$XCPPFLAGS"
-	${APPEND} CPPFLAGS "$$EXTRA_CPPFLAGS"
-	${SETVAR} CFLAGS "$$BFS_CFLAGS"
-	${APPEND} CFLAGS "$$ASAN_CFLAGS"
-	${APPEND} CFLAGS "$$LSAN_CFLAGS"
-	${APPEND} CFLAGS "$$MSAN_CFLAGS"
-	${APPEND} CFLAGS "$$TSAN_CFLAGS"
-	${APPEND} CFLAGS "$$UBSAN_CFLAGS"
-	${APPEND} CFLAGS "$$SAN_CFLAGS"
-	${APPEND} CFLAGS "$$GCOV_CFLAGS"
-	${APPEND} CFLAGS "$$LINT_CFLAGS"
-	${APPEND} CFLAGS "$$RELEASE_CFLAGS"
-	${APPEND} CFLAGS "$$XCFLAGS"
-	${APPEND} CFLAGS "$$EXTRA_CFLAGS"
-	${SETVAR} LDFLAGS "$$XLDFLAGS"
-	${SETVAR} LDLIBS "$$XLDLIBS"
-	${APPEND} LDLIBS "$$EXTRA_LDLIBS"
-	${APPEND} LDLIBS "$$BFS_LDLIBS"
-	${SETVAR} NOLIBS "$$XNOLIBS"
-	test "${OS}-${SAN}" != FreeBSD-y || printf 'POSTLINK = elfctl -e +noaslr $$@\n' >>$@
-	${VCAT} $@
diff --git a/config/has/acl-get-entry.c b/config/has/acl-get-entry.c
deleted file mode 100644
index 3cce771..0000000
--- a/config/has/acl-get-entry.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include 
-#include 
-
-int main(void) {
-	acl_t acl = acl_get_file(".", ACL_TYPE_DEFAULT);
-	acl_entry_t entry;
-	return acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
-}
diff --git a/config/has/acl-get-file.c b/config/has/acl-get-file.c
deleted file mode 100644
index 89fbf23..0000000
--- a/config/has/acl-get-file.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include 
-#include 
-#include 
-
-int main(void) {
-	acl_t acl = acl_get_file(".", ACL_TYPE_DEFAULT);
-	return acl == (acl_t)NULL;
-}
diff --git a/config/has/acl-get-tag-type.c b/config/has/acl-get-tag-type.c
deleted file mode 100644
index 2901956..0000000
--- a/config/has/acl-get-tag-type.c
+++ /dev/null
@@ -1,10 +0,0 @@
-#include 
-#include 
-#include 
-
-int main(void) {
-	acl_entry_t entry;
-	memset(&entry, 0, sizeof(entry));
-	acl_tag_t tag;
-	return acl_get_tag_type(entry, &tag);
-}
diff --git a/config/has/acl-is-trivial-np.c b/config/has/acl-is-trivial-np.c
deleted file mode 100644
index 9ca9fc7..0000000
--- a/config/has/acl-is-trivial-np.c
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-
-int main(void) {
-	acl_t acl = acl_get_fd(3);
-	int trivial;
-	acl_is_trivial_np(acl, &trivial);
-	return 0;
-}
diff --git a/config/has/acl-trivial.c b/config/has/acl-trivial.c
deleted file mode 100644
index 7efc838..0000000
--- a/config/has/acl-trivial.c
+++ /dev/null
@@ -1,8 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	return acl_trivial(".");
-}
diff --git a/config/has/aligned-alloc.c b/config/has/aligned-alloc.c
deleted file mode 100644
index 4460038..0000000
--- a/config/has/aligned-alloc.c
+++ /dev/null
@@ -1,8 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	return !aligned_alloc(_Alignof(void *), sizeof(void *));
-}
diff --git a/config/has/confstr.c b/config/has/confstr.c
deleted file mode 100644
index 58280b4..0000000
--- a/config/has/confstr.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	confstr(_CS_PATH, NULL, 0);
-	return 0;
-}
diff --git a/config/has/extattr-get-file.c b/config/has/extattr-get-file.c
deleted file mode 100644
index ac9cf96..0000000
--- a/config/has/extattr-get-file.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-#include 
-
-int main(void) {
-	return extattr_get_file("file", EXTATTR_NAMESPACE_USER, "xattr", NULL, 0);
-}
diff --git a/config/has/extattr-get-link.c b/config/has/extattr-get-link.c
deleted file mode 100644
index c35be5b..0000000
--- a/config/has/extattr-get-link.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-#include 
-
-int main(void) {
-	return extattr_get_link("link", EXTATTR_NAMESPACE_USER, "xattr", NULL, 0);
-}
diff --git a/config/has/extattr-list-file.c b/config/has/extattr-list-file.c
deleted file mode 100644
index e68a8bb..0000000
--- a/config/has/extattr-list-file.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-#include 
-
-int main(void) {
-	return extattr_list_file("file", EXTATTR_NAMESPACE_USER, NULL, 0);
-}
diff --git a/config/has/extattr-list-link.c b/config/has/extattr-list-link.c
deleted file mode 100644
index 49f0ec2..0000000
--- a/config/has/extattr-list-link.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-#include 
-
-int main(void) {
-	return extattr_list_link("link", EXTATTR_NAMESPACE_USER, NULL, 0);
-}
diff --git a/config/has/fdclosedir.c b/config/has/fdclosedir.c
deleted file mode 100644
index f4ad1f5..0000000
--- a/config/has/fdclosedir.c
+++ /dev/null
@@ -1,8 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	return fdclosedir(opendir("."));
-}
diff --git a/config/has/getdents.c b/config/has/getdents.c
deleted file mode 100644
index d0d4228..0000000
--- a/config/has/getdents.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct dirent de;
-	getdents(3, &de, 1024);
-	return 0;
-}
diff --git a/config/has/getdents64-syscall.c b/config/has/getdents64-syscall.c
deleted file mode 100644
index 4838c14..0000000
--- a/config/has/getdents64-syscall.c
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-#include 
-
-int main(void) {
-	struct dirent64 de;
-	syscall(SYS_getdents64, 3, &de, 1024);
-	return 0;
-}
diff --git a/config/has/getdents64.c b/config/has/getdents64.c
deleted file mode 100644
index 1abf36d..0000000
--- a/config/has/getdents64.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct dirent64 de;
-	getdents64(3, &de, 1024);
-	return 0;
-}
diff --git a/config/has/getprogname-gnu.c b/config/has/getprogname-gnu.c
deleted file mode 100644
index 6b97c5e..0000000
--- a/config/has/getprogname-gnu.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	const char *str = program_invocation_short_name;
-	return str[0];
-}
diff --git a/config/has/getprogname.c b/config/has/getprogname.c
deleted file mode 100644
index 83dc8e8..0000000
--- a/config/has/getprogname.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	const char *str = getprogname();
-	return str[0];
-}
diff --git a/config/has/max-align-t.c b/config/has/max-align-t.c
deleted file mode 100644
index 96165ce..0000000
--- a/config/has/max-align-t.c
+++ /dev/null
@@ -1,8 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	return _Alignof(max_align_t);
-}
diff --git a/config/has/pipe2.c b/config/has/pipe2.c
deleted file mode 100644
index 4cb43b5..0000000
--- a/config/has/pipe2.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-
-int main(void) {
-	int fds[2];
-	return pipe2(fds, O_CLOEXEC);
-}
diff --git a/config/has/posix-spawn-addfchdir-np.c b/config/has/posix-spawn-addfchdir-np.c
deleted file mode 100644
index b870a53..0000000
--- a/config/has/posix-spawn-addfchdir-np.c
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	posix_spawn_file_actions_t actions;
-	posix_spawn_file_actions_init(&actions);
-	posix_spawn_file_actions_addfchdir_np(&actions, 3);
-	return 0;
-}
diff --git a/config/has/posix-spawn-addfchdir.c b/config/has/posix-spawn-addfchdir.c
deleted file mode 100644
index c52ff81..0000000
--- a/config/has/posix-spawn-addfchdir.c
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	posix_spawn_file_actions_t actions;
-	posix_spawn_file_actions_init(&actions);
-	posix_spawn_file_actions_addfchdir(&actions, 3);
-	return 0;
-}
diff --git a/config/has/st-acmtim.c b/config/has/st-acmtim.c
deleted file mode 100644
index d687ab0..0000000
--- a/config/has/st-acmtim.c
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct stat sb = {0};
-	unsigned int a = sb.st_atim.tv_sec;
-	unsigned int c = sb.st_ctim.tv_sec;
-	unsigned int m = sb.st_mtim.tv_sec;
-	return a + c + m;
-}
diff --git a/config/has/st-acmtimespec.c b/config/has/st-acmtimespec.c
deleted file mode 100644
index f747bc0..0000000
--- a/config/has/st-acmtimespec.c
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct stat sb = {0};
-	unsigned int a = sb.st_atimespec.tv_sec;
-	unsigned int c = sb.st_ctimespec.tv_sec;
-	unsigned int m = sb.st_mtimespec.tv_sec;
-	return a + c + m;
-}
diff --git a/config/has/st-birthtim.c b/config/has/st-birthtim.c
deleted file mode 100644
index 4964571..0000000
--- a/config/has/st-birthtim.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct stat sb = {0};
-	return sb.st_birthtim.tv_sec;
-}
diff --git a/config/has/st-birthtimespec.c b/config/has/st-birthtimespec.c
deleted file mode 100644
index 91a613f..0000000
--- a/config/has/st-birthtimespec.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct stat sb = {0};
-	return sb.st_birthtimespec.tv_sec;
-}
diff --git a/config/has/st-flags.c b/config/has/st-flags.c
deleted file mode 100644
index b1d0c32..0000000
--- a/config/has/st-flags.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct stat sb = {0};
-	return sb.st_flags;
-}
diff --git a/config/has/statx-syscall.c b/config/has/statx-syscall.c
deleted file mode 100644
index 87ec869..0000000
--- a/config/has/statx-syscall.c
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-#include 
-#include 
-
-int main(void) {
-	struct statx sb;
-	syscall(SYS_statx, AT_FDCWD, ".", 0, STATX_BASIC_STATS, &sb);
-	return 0;
-}
diff --git a/config/has/statx.c b/config/has/statx.c
deleted file mode 100644
index 65f1674..0000000
--- a/config/has/statx.c
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-
-int main(void) {
-	struct statx sb;
-	statx(AT_FDCWD, ".", 0, STATX_BASIC_STATS, &sb);
-	return 0;
-}
diff --git a/config/has/strerror-l.c b/config/has/strerror-l.c
deleted file mode 100644
index 3dcc4d7..0000000
--- a/config/has/strerror-l.c
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-#include 
-
-int main(void) {
-	locale_t locale = duplocale(LC_GLOBAL_LOCALE);
-	return !strerror_l(ENOMEM, locale);
-}
diff --git a/config/has/strerror-r-gnu.c b/config/has/strerror-r-gnu.c
deleted file mode 100644
index 26ca0ee..0000000
--- a/config/has/strerror-r-gnu.c
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-
-int main(void) {
-	char buf[256];
-	// Check that strerror_r() returns a pointer
-	return *strerror_r(ENOMEM, buf, sizeof(buf));
-}
diff --git a/config/has/strerror-r-posix.c b/config/has/strerror-r-posix.c
deleted file mode 100644
index 41b2d30..0000000
--- a/config/has/strerror-r-posix.c
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-#include 
-
-int main(void) {
-	char buf[256];
-	// Check that strerror_r() returns an integer
-	return 2 * strerror_r(ENOMEM, buf, sizeof(buf));
-}
diff --git a/config/has/tm-gmtoff.c b/config/has/tm-gmtoff.c
deleted file mode 100644
index 543df48..0000000
--- a/config/has/tm-gmtoff.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	struct tm tm = {0};
-	return tm.tm_gmtoff;
-}
diff --git a/config/has/uselocale.c b/config/has/uselocale.c
deleted file mode 100644
index a712ff8..0000000
--- a/config/has/uselocale.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	locale_t locale = uselocale((locale_t)0);
-	return locale == LC_GLOBAL_LOCALE;
-}
diff --git a/config/header.mk b/config/header.mk
deleted file mode 100644
index 50ad5e8..0000000
--- a/config/header.mk
+++ /dev/null
@@ -1,69 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Makefile that generates gen/config.h
-
-include config/prelude.mk
-include ${GEN}/config.mk
-include config/exports.mk
-
-# All header fragments we generate
-HEADERS := \
-    ${GEN}/has/acl-get-entry.h \
-    ${GEN}/has/acl-get-file.h \
-    ${GEN}/has/acl-get-tag-type.h \
-    ${GEN}/has/acl-is-trivial-np.h \
-    ${GEN}/has/acl-trivial.h \
-    ${GEN}/has/aligned-alloc.h \
-    ${GEN}/has/confstr.h \
-    ${GEN}/has/extattr-get-file.h \
-    ${GEN}/has/extattr-get-link.h \
-    ${GEN}/has/extattr-list-file.h \
-    ${GEN}/has/extattr-list-link.h \
-    ${GEN}/has/fdclosedir.h \
-    ${GEN}/has/getdents.h \
-    ${GEN}/has/getdents64.h \
-    ${GEN}/has/getdents64-syscall.h \
-    ${GEN}/has/getprogname.h \
-    ${GEN}/has/getprogname-gnu.h \
-    ${GEN}/has/max-align-t.h \
-    ${GEN}/has/pipe2.h \
-    ${GEN}/has/posix-spawn-addfchdir.h \
-    ${GEN}/has/posix-spawn-addfchdir-np.h \
-    ${GEN}/has/st-acmtim.h \
-    ${GEN}/has/st-acmtimespec.h \
-    ${GEN}/has/st-birthtim.h \
-    ${GEN}/has/st-birthtimespec.h \
-    ${GEN}/has/st-flags.h \
-    ${GEN}/has/statx.h \
-    ${GEN}/has/statx-syscall.h \
-    ${GEN}/has/strerror-l.h \
-    ${GEN}/has/strerror-r-gnu.h \
-    ${GEN}/has/strerror-r-posix.h \
-    ${GEN}/has/tm-gmtoff.h \
-    ${GEN}/has/uselocale.h
-
-# Previously generated by pkgs.mk
-PKG_HEADERS := ${ALL_PKGS:%=${GEN}/use/%.h}
-
-${GEN}/config.h: ${PKG_HEADERS} ${HEADERS}
-	${MSG} "[ GEN] ${TGT}"
-	printf '// %s\n' "${TGT}" >$@
-	printf '#ifndef BFS_CONFIG_H\n' >>$@
-	printf '#define BFS_CONFIG_H\n' >>$@
-	cat ${.ALLSRC} >>$@
-	printf '#endif // BFS_CONFIG_H\n' >>$@
-	cat ${.ALLSRC:%=%.log} >$@.log
-	${VCAT} $@
-.PHONY: ${GEN}/config.h
-
-# The short name of the config test
-SLUG = ${@:${GEN}/%.h=%}
-
-${HEADERS}::
-	${MKDIR} ${@D}
-	if config/define-if.sh ${SLUG} config/cc.sh config/${SLUG}.c >$@ 2>$@.log; then \
-	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✔\n' ${SLUG}.c; \
-	else \
-	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✘\n' ${SLUG}.c; \
-	fi
diff --git a/config/pkgconf.sh b/config/pkgconf.sh
deleted file mode 100755
index 365ed61..0000000
--- a/config/pkgconf.sh
+++ /dev/null
@@ -1,100 +0,0 @@
-#!/bin/sh
-
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# pkg-config wrapper with hardcoded fallbacks
-
-set -eu
-
-MODE=
-case "${1:-}" in
-    --*)
-        MODE="$1"
-        shift
-esac
-
-if [ $# -lt 1 ]; then
-    exit
-fi
-
-case "$XNOLIBS" in
-    y|1)
-        exit 1
-esac
-
-if [ -z "$MODE" ]; then
-    # Check whether the libraries exist at all
-    for LIB; do
-        # Check ${USE_$LIB}
-        USE_LIB="USE_$(printf '%s' "$LIB" | tr 'a-z-' 'A-Z_')"
-        eval "USE=\"\${$USE_LIB:-}\""
-        case "$USE" in
-            y|1)
-                continue
-                ;;
-            n|0)
-                exit 1
-                ;;
-        esac
-
-        CFLAGS=$("$0" --cflags "$LIB") || exit 1
-        LDFLAGS=$("$0" --ldflags "$LIB") || exit 1
-        LDLIBS=$("$0" --ldlibs "$LIB") || exit 1
-        config/cc.sh $CFLAGS $LDFLAGS config/use/$LIB.c $LDLIBS || exit 1
-    done
-fi
-
-# Defer to pkg-config if possible
-if command -v "${XPKG_CONFIG:-}" >/dev/null 2>&1; then
-    case "$MODE" in
-        --cflags)
-            "$XPKG_CONFIG" --cflags "$@"
-            ;;
-        --ldflags)
-            "$XPKG_CONFIG" --libs-only-L --libs-only-other "$@"
-            ;;
-        --ldlibs)
-            "$XPKG_CONFIG" --libs-only-l "$@"
-            ;;
-    esac
-
-    exit
-fi
-
-# pkg-config unavailable, emulate it ourselves
-CFLAGS=""
-LDFLAGS=""
-LDLIBS=""
-
-for LIB; do
-    case "$LIB" in
-        libacl)
-            LDLIB=-lacl
-            ;;
-        libcap)
-            LDLIB=-lcap
-            ;;
-        libselinux)
-            LDLIB=-lselinux
-            ;;
-        liburing)
-            LDLIB=-luring
-            ;;
-        oniguruma)
-            LDLIB=-lonig
-            ;;
-        *)
-            printf 'error: Unknown package %s\n' "$LIB" >&2
-            exit 1
-            ;;
-    esac
-
-    LDLIBS="$LDLIBS$LDLIB "
-done
-
-case "$MODE" in
-    --ldlibs)
-        printf '%s\n' "$LDLIBS"
-    ;;
-esac
diff --git a/config/pkgs.mk b/config/pkgs.mk
deleted file mode 100644
index 898f262..0000000
--- a/config/pkgs.mk
+++ /dev/null
@@ -1,36 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Makefile that generates gen/pkgs.mk
-
-include config/prelude.mk
-include ${GEN}/vars.mk
-include ${GEN}/flags.mk
-include config/exports.mk
-
-HEADERS := ${ALL_PKGS:%=${GEN}/use/%.h}
-
-${GEN}/pkgs.mk: ${HEADERS}
-	${MSG} "[ GEN] ${TGT}"
-	printf '# %s\n' "${TGT}" >$@
-	gen() { \
-	    printf 'PKGS := %s\n' "$$*"; \
-	    printf 'CFLAGS += %s\n' "$$(config/pkgconf.sh --cflags "$$@")"; \
-	    printf 'LDFLAGS += %s\n' "$$(config/pkgconf.sh --ldflags "$$@")"; \
-	    printf 'LDLIBS := %s $${LDLIBS}\n' "$$(config/pkgconf.sh --ldlibs "$$@")"; \
-	}; \
-	gen $$(grep -l ' true$$' ${.ALLSRC} | sed 's|.*/\(.*\)\.h|\1|') >>$@
-	${VCAT} $@
-
-.PHONY: ${GEN}/pkgs.mk
-
-# Convert ${GEN}/use/foo.h to foo
-PKG = ${@:${GEN}/use/%.h=%}
-
-${HEADERS}::
-	${MKDIR} ${@D}
-	if config/define-if.sh use/${PKG} config/pkgconf.sh ${PKG} >$@ 2>$@.log; then \
-	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✔\n' use/${PKG}.c; \
-	else \
-	    test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s  ✘\n' use/${PKG}.c; \
-	fi
diff --git a/config/prelude.mk b/config/prelude.mk
deleted file mode 100644
index 109e60c..0000000
--- a/config/prelude.mk
+++ /dev/null
@@ -1,162 +0,0 @@
-# Copyright © Tavian Barnes 
-# SPDX-License-Identifier: 0BSD
-
-# Common makefile utilities.  Compatible with both GNU make and most BSD makes.
-
-# BSD make will chdir into ${.OBJDIR} by default, unless we tell it not to
-.OBJDIR: .
-
-# We don't use any suffix rules
-.SUFFIXES:
-
-# GNU make has $^ for the full list of targets, while BSD make has $> and the
-# long-form ${.ALLSRC}.  We could write $^ $> to get them both, but that would
-# break if one of them implemented support for the other.  So instead, bring
-# BSD's ${.ALLSRC} to GNU.
-.ALLSRC ?= $^
-
-# For out-of-tree builds, e.g.
-#
-#     $ make config BUILDDIR=/path/to/build/dir
-#     $ make BUILDDIR=/path/to/build/dir
-BUILDDIR ?= .
-
-# Shorthand for build subdirectories
-BIN := ${BUILDDIR}/bin
-GEN := ${BUILDDIR}/gen
-OBJ := ${BUILDDIR}/obj
-
-# GNU make strips a leading ./ from target names, so do the same for BSD make
-BIN := ${BIN:./%=%}
-GEN := ${GEN:./%=%}
-OBJ := ${OBJ:./%=%}
-
-# The configuration file generated by `make config`
-CONFIG := ${GEN}/config.mk
-
-# Installation paths
-DESTDIR ?=
-PREFIX ?= /usr
-MANDIR ?= ${PREFIX}/share/man
-
-# GNU make supports `export VAR`, but BSD make requires `export VAR=value`.
-# Sadly, GNU make gives a recursion error on `export VAR=${VAR}`.
-_BUILDDIR := ${BUILDDIR}
-export BUILDDIR=${_BUILDDIR}
-
-# Configurable executables; can be overridden with
-#
-#     $ make config CC=clang
-CC ?= cc
-INSTALL ?= install
-MKDIR ?= mkdir -p
-PKG_CONFIG ?= pkg-config
-RM ?= rm -f
-
-# GNU and BSD make have incompatible syntax for conditionals, but we can do a
-# lot with just nested variable expansion.  We use "y" as the canonical
-# truthy value, and "" (the empty string) as the canonical falsey value.
-#
-# To normalize a boolean, use ${TRUTHY,${VAR}}, which expands like this:
-#
-#     VAR=y      ${TRUTHY,${VAR}} => ${TRUTHY,y}     => y
-#     VAR=1      ${TRUTHY,${VAR}} => ${TRUTHY,1}     => y
-#     VAR=n      ${TRUTHY,${VAR}} => ${TRUTHY,n}     =>   [empty]
-#     VAR=other  ${TRUTHY,${VAR}} => ${TRUTHY,other} =>   [empty]
-#     VAR=       ${TRUTHY,${VAR}} => ${TRUTHY,}      =>   [emtpy]
-#
-# Inspired by https://github.com/wahern/autoguess
-TRUTHY,y := y
-TRUTHY,1 := y
-
-# Boolean operators are also implemented with nested expansion
-NOT,  := y
-
-# Normalize ${V} to either "y" or ""
-IS_V := ${TRUTHY,${V}}
-
-# Suppress output unless V=1
-Q, := @
-Q  := ${Q,${IS_V}}
-
-# The current target, with ${BUILDDIR} stripped for shorter messages
-TGT = ${@:${BUILDDIR}/%=%}
-
-# Show full commands with `make V=1`, otherwise short summaries
-MSG = @msg() { \
-          MSG="$$1"; \
-          shift; \
-          test "${IS_V}" || printf '%s\n' "$$MSG"; \
-          test "$${1:-}" || return 0; \
-          test "${IS_V}" && printf '%s\n' "$$*"; \
-          "$$@"; \
-      }; \
-      msg
-
-# Maximum width of a short message, to align the ✔/✘
-MSG_WIDTH := 30
-
-# cat a file if V=1
-VCAT,y := @cat
-VCAT,  := @:
-VCAT   := ${VCAT,${IS_V}}
-
-# All external dependencies
-ALL_PKGS := \
-    libacl \
-    libcap \
-    libselinux \
-    liburing \
-    oniguruma
-
-# List all object files here, as they're needed by both `make config` and `make`
-
-# All object files except the entry point
-LIBBFS := \
-    ${OBJ}/src/alloc.o \
-    ${OBJ}/src/bar.o \
-    ${OBJ}/src/bfstd.o \
-    ${OBJ}/src/bftw.o \
-    ${OBJ}/src/color.o \
-    ${OBJ}/src/ctx.o \
-    ${OBJ}/src/diag.o \
-    ${OBJ}/src/dir.o \
-    ${OBJ}/src/dstring.o \
-    ${OBJ}/src/eval.o \
-    ${OBJ}/src/exec.o \
-    ${OBJ}/src/expr.o \
-    ${OBJ}/src/fsade.o \
-    ${OBJ}/src/ioq.o \
-    ${OBJ}/src/mtab.o \
-    ${OBJ}/src/opt.o \
-    ${OBJ}/src/parse.o \
-    ${OBJ}/src/printf.o \
-    ${OBJ}/src/pwcache.o \
-    ${OBJ}/src/stat.o \
-    ${OBJ}/src/thread.o \
-    ${OBJ}/src/trie.o \
-    ${OBJ}/src/typo.o \
-    ${OBJ}/src/xregex.o \
-    ${OBJ}/src/xspawn.o \
-    ${OBJ}/src/xtime.o \
-    ${OBJ}/gen/version.o
-
-# Unit test objects
-UNIT_OBJS := \
-    ${OBJ}/tests/alloc.o \
-    ${OBJ}/tests/bfstd.o \
-    ${OBJ}/tests/bit.o \
-    ${OBJ}/tests/ioq.o \
-    ${OBJ}/tests/main.o \
-    ${OBJ}/tests/trie.o \
-    ${OBJ}/tests/xspawn.o \
-    ${OBJ}/tests/xtime.o
-
-# All object files
-OBJS := \
-    ${OBJ}/src/main.o \
-    ${OBJ}/tests/mksock.o \
-    ${OBJ}/tests/xspawnee.o \
-    ${OBJ}/tests/xtouch.o \
-    ${LIBBFS} \
-    ${UNIT_OBJS}
diff --git a/config/use/libacl.c b/config/use/libacl.c
deleted file mode 100644
index de1fe50..0000000
--- a/config/use/libacl.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	acl_free(0);
-	return 0;
-}
diff --git a/config/use/libcap.c b/config/use/libcap.c
deleted file mode 100644
index 58e832c..0000000
--- a/config/use/libcap.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	cap_free(0);
-	return 0;
-}
diff --git a/config/use/libselinux.c b/config/use/libselinux.c
deleted file mode 100644
index bca409d..0000000
--- a/config/use/libselinux.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	freecon(0);
-	return 0;
-}
diff --git a/config/use/liburing.c b/config/use/liburing.c
deleted file mode 100644
index bea499a..0000000
--- a/config/use/liburing.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	io_uring_free_probe(0);
-	return 0;
-}
diff --git a/config/use/oniguruma.c b/config/use/oniguruma.c
deleted file mode 100644
index cb17596..0000000
--- a/config/use/oniguruma.c
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright © Tavian Barnes 
-// SPDX-License-Identifier: 0BSD
-
-#include 
-
-int main(void) {
-	onig_free(0);
-	return 0;
-}
diff --git a/configure b/configure
new file mode 100755
index 0000000..6920212
--- /dev/null
+++ b/configure
@@ -0,0 +1,98 @@
+#!/bin/sh
+
+# Copyright © Tavian Barnes 
+# SPDX-License-Identifier: 0BSD
+
+# bfs build configuration script
+
+set -eu
+
+help() {
+    cat <] [CC=...] [CFLAGS=...] [...]
+
+Compiler configuration:
+
+  CC
+      The C compiler to use
+  CPPFLAGS
+      C preprocessor flags
+  CFLAGS
+      C compiler flags
+  LDFLAGS
+      Linker flags
+  LDLIBS
+      Dynamic libraries to link
+
+  EXTRA_CPPFLAGS
+  EXTRA_CFLAGS
+  EXTRA_LDFLAGS
+  EXTRA_LDLIBS
+      Adds to the default flags, instead of replacing them
+
+Build profiles:
+
+  RELEASE=y
+      Enable optimizations, disable assertions
+  ASAN=y
+  LSAN=y
+  MSAN=y
+  TSAN=y
+  UBSAN=y
+      Enable sanitizers
+  GCOV=y
+      Enable code coverage instrumentation
+
+External dependencies:
+
+  PKG_CONFIG
+      The pkg-config binary to use
+
+  USE_LIBACL=[y|n]
+  USE_LIBCAP=[y|n]
+  USE_LIBSELINUX=[y|n]
+  USE_LIBURIG=[y|n]
+  USE_ONIGURUMA=[y|n]
+      Enable or disable external dependencies
+
+Packaging configuration:
+
+  PREFIX
+      Set the installation prefix (default: /usr)
+  MANDIR
+      Set the man page directory (default: \$PREFIX/share/man)
+EOF
+}
+
+for arg; do
+    case "$arg" in
+        --help)
+            help
+            exit 0
+            ;;
+        -*|*=*)
+            continue # make flag (-j2) or variable (CC=clang)
+            ;;
+        *)
+            printf 'error: Unrecognized option "%s"\n\n' "$arg" >&2
+            help >&2
+            exit 1
+            ;;
+    esac
+done
+
+# Get the relative path to the source tree based on how the script was run
+DIR=$(dirname -- "$0")
+
+# Set up symbolic links for out-of-tree builds
+for f in Makefile build completions docs src tests; do
+    test -e "$f" || ln -s "$DIR/$f" "$f"
+done
+
+# Infer -jN unless MAKEFLAGS is set
+j=
+if ! [ "${MAKEFLAGS+y}" ]; then
+    j="-j$({ nproc || sysctl -n hw.ncpu || getconf _NPROCESSORS_ONLN || echo 1; } 2>/dev/null)"
+fi
+
+${MAKE:-make} $j -rsf build/config.mk "$@"
diff --git a/docs/BUILDING.md b/docs/BUILDING.md
index 4ed139c..db5d721 100644
--- a/docs/BUILDING.md
+++ b/docs/BUILDING.md
@@ -4,10 +4,9 @@ Building `bfs`
 Compiling
 ---------
 
-`bfs` uses [GNU Make](https://www.gnu.org/software/make/) as its build system.
 A simple invocation of
 
-    $ make config
+    $ ./configure
     $ make
 
 should build `bfs` successfully.
@@ -18,7 +17,6 @@ For example, to use all your cores, run `make -j$(nproc)`.
 
 | Command          | Description                                                   |
 |------------------|---------------------------------------------------------------|
-| `make config`    | Configures the build system                                   |
 | `make`           | Builds just the `bfs` binary                                  |
 | `make all`       | Builds everything, including the tests (but doesn't run them) |
 | `make check`     | Builds everything, and runs the tests                         |
@@ -33,13 +31,13 @@ The configuration system provides a few shorthand flags for handy configurations
 
 | Command                 | Description                                                 |
 |-------------------------|-------------------------------------------------------------|
-| `make config RELEASE=y` | Build `bfs` with optimizations, LTO, and without assertions |
-| `make config ASAN=y`    | Enable [AddressSanitizer]                                   |
-| `make config LSAN=y`    | Enable [LeakSanitizer]                                      |
-| `make config MSAN=y`    | Enable [MemorySanitizer]                                    |
-| `make config TSAN=y`    | Enable [ThreadSanitizer]                                    |
-| `make config UBSAN=y`   | Enable [UndefinedBehaviorSanitizer]                         |
-| `make config GCOV=y`    | Enable [code coverage]                                      |
+| `./configure RELEASE=y` | Build `bfs` with optimizations, LTO, and without assertions |
+| `./configure ASAN=y`    | Enable [AddressSanitizer]                                   |
+| `./configure LSAN=y`    | Enable [LeakSanitizer]                                      |
+| `./configure MSAN=y`    | Enable [MemorySanitizer]                                    |
+| `./configure TSAN=y`    | Enable [ThreadSanitizer]                                    |
+| `./configure UBSAN=y`   | Enable [UndefinedBehaviorSanitizer]                         |
+| `./configure GCOV=y`    | Enable [code coverage]                                      |
 
 [AddressSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizer
 [LeakSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer#stand-alone-mode
@@ -48,21 +46,20 @@ The configuration system provides a few shorthand flags for handy configurations
 [UndefinedBehaviorSanitizer]: https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html
 [code coverage]: https://gcc.gnu.org/onlinedocs/gcc/Gcov.html
 
-You can combine multiple profiles (e.g. `make config ASAN=y UBSAN=y`), but not all of them will work together.
+You can combine multiple profiles (e.g. `./configure ASAN=y UBSAN=y`), but not all of them will work together.
 
 ### Flags
 
-Other flags can be specified on the `make config` command line or in the environment.
+Other flags can be specified on the `./configure` command line or in the environment.
 Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
 
 | Flag                                | Description                                        |
 |-------------------------------------|----------------------------------------------------|
-| `CC`                                | The C compiler to use, e.g. `make config CC=clang` |
+| `CC`                                | The C compiler to use, e.g. `./configure CC=clang` |
 | `CFLAGS`
`EXTRA_CFLAGS`          | Override/add to the default compiler flags         |
 | `LDFLAGS`
`EXTRA_LDFLAGS`        | Override/add to the linker flags                   |
 | `USE_LIBACL`
`USE_LIBCAP`
... | Enable/disable [optional dependencies]             |
 | `TEST_FLAGS`                        | `tests.sh` flags for `make check`                  |
-| `BUILDDIR`                          | The build output directory (default: `.`)          |
 | `DESTDIR`                           | The root directory for `make install`              |
 | `PREFIX`                            | The installation prefix (default: `/usr`)          |
 | `MANDIR`                            | The man page installation directory                |
@@ -72,9 +69,9 @@ Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
 ### Dependencies
 
 `bfs` depends on some system libraries for some of its features.
-These dependencies are optional, and can be turned off in `make config` if necessary by setting the appropriate variable to `n` (e.g. `make config USE_ONIGURUMA=n`).
+These dependencies are optional, and can be turned off in `./configure` if necessary by setting the appropriate variable to `n` (e.g. `./configure USE_ONIGURUMA=n`).
 
-| Dependency   | Platforms  | `make config` flag |
+| Dependency   | Platforms  | `./configure` flag |
 |--------------|------------|--------------------|
 | [libacl]     | Linux only | `USE_LIBACL`       |
 | [libcap]     | Linux only | `USE_LIBCAP`       |
@@ -90,22 +87,28 @@ These dependencies are optional, and can be turned off in `make config` if neces
 
 ### Dependency tracking
 
-The build system automatically tracks header dependencies with the `-M` family of compiler options (see `DEPFLAGS` in the [`Makefile`](/Makefile)).
+The build system automatically tracks header dependencies with the `-M` family of compiler options (see `DEPFLAGS` in [`build/deps.mk`](/build/deps.mk)).
 So if you edit a header file, `make` will rebuild the necessary object files ensuring they don't go out of sync.
 
 We also add a dependency on the current configuration, so you can change configurations and rebuild without having to `make clean`.
-
-We go one step further than most build systems by tracking the flags that were used for the previous compilation.
-That means you can change configurations without having to `make clean`.
 For example,
 
-    $ make config
+    $ ./configure
     $ make
-    $ make config RELEASE=y
+    $ ./configure RELEASE=y
     $ make
 
 will build the project in debug mode and then rebuild it in release mode.
 
+### Out-of-tree builds
+
+You can set up an out-of-tree build by running the `configure` script from another directory, for example:
+
+    $ mkdir out
+    $ cd out
+    $ ../configure
+    $ make
+
 
 Testing
 -------
diff --git a/tests/util.sh b/tests/util.sh
index 7dba9fb..3969db5 100644
--- a/tests/util.sh
+++ b/tests/util.sh
@@ -12,12 +12,9 @@ _realpath() (
 )
 
 # Globals
-TESTS=$(_realpath "$TESTS")
-if [ "${BUILDDIR-}" ]; then
-    BIN=$(_realpath "$BUILDDIR/bin")
-else
-    BIN=$(_realpath "$TESTS/../bin")
-fi
+ROOT=$(_realpath "$(dirname -- "$TESTS")")
+TESTS="$ROOT/tests"
+BIN="$ROOT/bin"
 MKSOCK="$BIN/tests/mksock"
 XTOUCH="$BIN/tests/xtouch"
 UNAME=$(uname)
diff --git a/tests/xspawn.c b/tests/xspawn.c
index 7362aa5..785ea48 100644
--- a/tests/xspawn.c
+++ b/tests/xspawn.c
@@ -64,27 +64,20 @@ static bool check_use_path(bool use_posix) {
 		spawn.flags &= ~BFS_SPAWN_USE_POSIX;
 	}
 
-	const char *builddir = getenv("BUILDDIR");
-	dchar *bin = dstrprintf("%s/bin", builddir ? builddir : ".");
-	ret &= bfs_pcheck(bin, "dstrprintf()");
-	if (!ret) {
-		goto destroy;
-	}
-
-	ret &= bfs_pcheck(bfs_spawn_addopen(&spawn, 10, bin, O_RDONLY | O_DIRECTORY, 0) == 0);
+	ret &= bfs_pcheck(bfs_spawn_addopen(&spawn, 10, "bin", O_RDONLY | O_DIRECTORY, 0) == 0);
 	ret &= bfs_pcheck(bfs_spawn_adddup2(&spawn, 10, 11) == 0);
 	ret &= bfs_pcheck(bfs_spawn_addclose(&spawn, 10) == 0);
 	ret &= bfs_pcheck(bfs_spawn_addfchdir(&spawn, 11) == 0);
 	ret &= bfs_pcheck(bfs_spawn_addclose(&spawn, 11) == 0);
 	if (!ret) {
-		goto bin;
+		goto destroy;
 	}
 
 	// Check that $PATH is resolved in the parent's environment
 	char **envp;
 	ret &= bfs_pcheck(envp = envdup());
 	if (!ret) {
-		goto bin;
+		goto destroy;
 	}
 
 	// Check that $PATH is resolved after the file actions
@@ -138,8 +131,6 @@ env:
 		free(*var);
 	}
 	free(envp);
-bin:
-	dstrfree(bin);
 destroy:
 	ret &= bfs_pcheck(bfs_spawn_destroy(&spawn) == 0);
 out:
-- 
cgit v1.2.3


From 99260d347b91f9f7ede335b7f582cee34ead2b0c Mon Sep 17 00:00:00 2001
From: Tavian Barnes 
Date: Wed, 1 May 2024 14:23:20 -0400
Subject: build: Add some nice aliases to ./configure

---
 .github/workflows/ci.yml      |   4 +-
 .github/workflows/codecov.yml |   2 +-
 Makefile                      |  10 +--
 build/header.mk               |   2 +-
 configure                     | 141 ++++++++++++++++++-----------
 docs/BUILDING.md              | 200 ++++++++++++++++++++++++++----------------
 6 files changed, 221 insertions(+), 138 deletions(-)

(limited to '.github/workflows/codecov.yml')

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 57f59f4..e47600b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -107,7 +107,7 @@ jobs:
                 gmake \
                 oniguruma
             jobs=$(sysctl -n hw.ncpu)
-            MAKE=gmake ./configure
+            ./configure MAKE=gmake
             gmake -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
 
   netbsd:
@@ -198,5 +198,5 @@ jobs:
             PATH="/usr/xpg4/bin:$PATH"
             chown -R action:staff .
             jobs=$(getconf NPROCESSORS_ONLN)
-            sudo -u action MAKE=gmake ./configure
+            sudo -u action ./configure MAKE=gmake
             sudo -u action gmake -j$jobs check TEST_FLAGS="--sudo --verbose=skipped"
diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index bb68927..6aaace6 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -25,7 +25,7 @@ jobs:
 
       - name: Generate coverage
         run: |
-          ./configure GCOV=y
+          ./configure --enable-gcov
           make -j$(nproc) check TEST_FLAGS="--sudo"
           gcov -abcfpu obj/*/*.o
 
diff --git a/Makefile b/Makefile
index cd8bb55..8a8ec6b 100644
--- a/Makefile
+++ b/Makefile
@@ -164,11 +164,11 @@ distcheck:
 .PHONY: distcheck
 
 # Per-distcheck configuration
-DISTCHECK_CONFIG_asan := ASAN=y UBSAN=y
-DISTCHECK_CONFIG_msan := MSAN=y UBSAN=y CC=clang
-DISTCHECK_CONFIG_tsan := TSAN=y UBSAN=y CC=clang
+DISTCHECK_CONFIG_asan := --enable-asan --enable-ubsan
+DISTCHECK_CONFIG_msan := --enable-msan --enable-ubsan CC=clang
+DISTCHECK_CONFIG_tsan := --enable-tsan --enable-ubsan CC=clang
 DISTCHECK_CONFIG_m32 := EXTRA_CFLAGS="-m32" PKG_CONFIG_LIBDIR=/usr/lib32/pkgconfig
-DISTCHECK_CONFIG_release := RELEASE=y
+DISTCHECK_CONFIG_release := --enable-release
 
 ${DISTCHECKS}::
 	@${MKDIR} $@
@@ -195,7 +195,7 @@ install::
 	${MSG} "[INST] completions/bfs.zsh" \
 	    ${INSTALL} -m644 completions/bfs.zsh ${DEST_PREFIX}/share/zsh/site-functions/_bfs
 	${Q}${MKDIR} ${DEST_PREFIX}/share/fish/vendor_completions.d
-		${MSG} "[INST] completions/bfs.fish" \
+	${MSG} "[INST] completions/bfs.fish" \
 	    ${INSTALL} -m644 completions/bfs.fish ${DEST_PREFIX}/share/fish/vendor_completions.d/bfs.fish
 
 uninstall::
diff --git a/build/header.mk b/build/header.mk
index 951f09b..a9157ad 100644
--- a/build/header.mk
+++ b/build/header.mk
@@ -53,7 +53,7 @@ gen/config.h: ${PKG_HEADERS} ${HEADERS}
 	@printf '#define BFS_CONFIG_H\n' >>$@
 	@cat ${.ALLSRC} >>$@
 	@printf '#endif // BFS_CONFIG_H\n' >>$@
-	@cat ${.ALLSRC:%=%.log} >$@.log
+	@cat ${.ALLSRC:%=%.log} >gen/config.log
 	${VCAT} $@
 .PHONY: gen/config.h
 
diff --git a/configure b/configure
index 830628a..d42dec3 100755
--- a/configure
+++ b/configure
@@ -7,75 +7,117 @@
 
 set -eu
 
-help() {
-    cat <] [CC=...] [CFLAGS=...] [...]
+# Default to `make`
+MAKE="${MAKE:-make}"
 
-Compiler configuration:
+# Pass -j$(nproc) unless MAKEFLAGS is set
+if [ "${MAKEFLAGS+y}" ]; then
+    j=""
+else
+    j="-j$({ nproc || sysctl -n hw.ncpu || getconf _NPROCESSORS_ONLN || echo 1; } 2>/dev/null)"
+fi
+
+for arg; do
+    case "$arg" in
+        -h|--help)
+            cat <&2
+                    printf 'Run %s --help for more information.\n' "$0" >&2
+                    exit 1
+                    ;;
+            esac
+            ;;
+
+        --prefix=*)
+            shift
+            set -- "$@" "PREFIX=${arg#*=}"
+            ;;
+
+        MAKE=*)
+            MAKE="${arg#*=}"
+            shift
+            ;;
+
+        # make flag (-j2) or variable (CC=clang)
         -*|*=*)
-            continue # make flag (-j2) or variable (CC=clang)
+            continue
             ;;
+
         *)
             printf 'error: Unrecognized option "%s"\n\n' "$arg" >&2
-            help >&2
+            printf 'Run %s --help for more information.\n' "$0" >&2
             exit 1
             ;;
     esac
@@ -89,10 +131,7 @@ for f in Makefile build completions docs src tests; do
     test -e "$f" || ln -s "$DIR/$f" "$f"
 done
 
-# Infer -jN unless MAKEFLAGS is set
-j=
-if ! [ "${MAKEFLAGS+y}" ]; then
-    j="-j$({ nproc || sysctl -n hw.ncpu || getconf _NPROCESSORS_ONLN || echo 1; } 2>/dev/null)"
-fi
+# Set MAKEFLAGS to -j$(nproc) if it's unset
+export MAKEFLAGS="${MAKEFLAGS-$j}"
 
-${MAKE:-make} $j -rf build/config.mk "$@"
+$MAKE -rf build/config.mk "$@"
diff --git a/docs/BUILDING.md b/docs/BUILDING.md
index db5d721..cb33c51 100644
--- a/docs/BUILDING.md
+++ b/docs/BUILDING.md
@@ -1,104 +1,101 @@
 Building `bfs`
 ==============
 
-Compiling
----------
-
 A simple invocation of
 
     $ ./configure
     $ make
 
 should build `bfs` successfully.
-As usual with `make`, you can run a [parallel build](https://www.gnu.org/software/make/manual/html_node/Parallel.html) with `-j`.
-For example, to use all your cores, run `make -j$(nproc)`.
 
-### Targets
 
-| Command          | Description                                                   |
-|------------------|---------------------------------------------------------------|
-| `make`           | Builds just the `bfs` binary                                  |
-| `make all`       | Builds everything, including the tests (but doesn't run them) |
-| `make check`     | Builds everything, and runs the tests                         |
-| `make install`   | Installs `bfs` (with man page, shell completions, etc.)       |
-| `make uninstall` | Uninstalls `bfs`                                              |
-| `make clean`     | Delete the build products                                     |
-| `make distclean` | Delete all generated files, including the build configuration |
+Configuration
+-------------
+
+```console
+$ ./configure --help
+Usage:
+
+  $ ./configure [--enable-*|--disable-*] [CC=...] [CFLAGS=...] [...]
+  $ make
+
+...
+```
+
+### Variables
+
+Variables set in the environment or on the command line will be picked up:
+These variables specify binaries to run during the configuration and build process:
+
+
+MAKE=make
+    make implementation
+CC=cc
+    C compiler
+INSTALL=install
+    Copy files during make install
+MKDIR="mkdir -p"
+    Create directories
+PKG_CONFIG=pkg-config
+    Detect external libraries and required build flags
+RM="rm -f"
+    Delete files
+

+
+These flags will be used by the build process:
+
+
+CPPFLAGS="-I... -D..."
+CFLAGS="-W... -f..."
+LDFLAGS="-L... -Wl,..."
+    Preprocessor/compiler/linker flags
+
+LDLIBS="-l... -l..."
+    Dynamic libraries to link
+
+EXTRA_{CPPFLAGS,CFLAGS,LDFLAGS,LDLIBS}="..."
+    Adds to the default flags, instead of replacing them
+

 
 ### Build profiles
 
-The configuration system provides a few shorthand flags for handy configurations:
-
-| Command                 | Description                                                 |
-|-------------------------|-------------------------------------------------------------|
-| `./configure RELEASE=y` | Build `bfs` with optimizations, LTO, and without assertions |
-| `./configure ASAN=y`    | Enable [AddressSanitizer]                                   |
-| `./configure LSAN=y`    | Enable [LeakSanitizer]                                      |
-| `./configure MSAN=y`    | Enable [MemorySanitizer]                                    |
-| `./configure TSAN=y`    | Enable [ThreadSanitizer]                                    |
-| `./configure UBSAN=y`   | Enable [UndefinedBehaviorSanitizer]                         |
-| `./configure GCOV=y`    | Enable [code coverage]                                      |
-
-[AddressSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizer
-[LeakSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer#stand-alone-mode
-[MemorySanitizer]: https://github.com/google/sanitizers/wiki/MemorySanitizer
-[ThreadSanitizer]: https://github.com/google/sanitizers/wiki/ThreadSanitizerCppManual
-[UndefinedBehaviorSanitizer]: https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html
-[code coverage]: https://gcc.gnu.org/onlinedocs/gcc/Gcov.html
-
-You can combine multiple profiles (e.g. `./configure ASAN=y UBSAN=y`), but not all of them will work together.
-
-### Flags
-
-Other flags can be specified on the `./configure` command line or in the environment.
-Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
-
-| Flag                                | Description                                        |
-|-------------------------------------|----------------------------------------------------|
-| `CC`                                | The C compiler to use, e.g. `./configure CC=clang` |
-| `CFLAGS`
`EXTRA_CFLAGS`          | Override/add to the default compiler flags         |
-| `LDFLAGS`
`EXTRA_LDFLAGS`        | Override/add to the linker flags                   |
-| `USE_LIBACL`
`USE_LIBCAP`
... | Enable/disable [optional dependencies]             |
-| `TEST_FLAGS`                        | `tests.sh` flags for `make check`                  |
-| `DESTDIR`                           | The root directory for `make install`              |
-| `PREFIX`                            | The installation prefix (default: `/usr`)          |
-| `MANDIR`                            | The man page installation directory                |
-
-[optional dependencies]: #dependencies
+The default flags result in a plain debug build.
+Other build profiles can be enabled:
 
-### Dependencies
+
+--enable-release
+    Enable optimizations, disable assertions
 
-`bfs` depends on some system libraries for some of its features.
-These dependencies are optional, and can be turned off in `./configure` if necessary by setting the appropriate variable to `n` (e.g. `./configure USE_ONIGURUMA=n`).
+--enable-asan
+--enable-lsan
+--enable-msan
+--enable-tsan
+--enable-ubsan
+    Enable sanitizers
 
-| Dependency   | Platforms  | `./configure` flag |
-|--------------|------------|--------------------|
-| [libacl]     | Linux only | `USE_LIBACL`       |
-| [libcap]     | Linux only | `USE_LIBCAP`       |
-| [liburing]   | Linux only | `USE_LIBURING`     |
-| [libselinux] | Linux only | `USE_LIBSELINUX`   |
-| [Oniguruma]  | All        | `USE_ONIGURUMA`    |
+--enable-gcov
+    Enable code coverage instrumentation
+

 
-[libacl]: https://savannah.nongnu.org/projects/acl
-[libcap]: https://sites.google.com/site/fullycapable/
-[libselinux]: https://github.com/SELinuxProject/selinux
-[liburing]: https://github.com/axboe/liburing
-[Oniguruma]: https://github.com/kkos/oniguruma
+You can combine multiple profiles (e.g. `./configure --enable-asan --enable-ubsan`), but not all of them will work together.
 
-### Dependency tracking
+### Dependencies
 
-The build system automatically tracks header dependencies with the `-M` family of compiler options (see `DEPFLAGS` in [`build/deps.mk`](/build/deps.mk)).
-So if you edit a header file, `make` will rebuild the necessary object files ensuring they don't go out of sync.
+`bfs` depends on some system libraries for some of its features.
+External dependencies are auto-detected by default, but you can `--enable` or `--disable` them manually:
 
-We also add a dependency on the current configuration, so you can change configurations and rebuild without having to `make clean`.
-For example,
+
+--enable-libacl      --disable-libacl
+--enable-libcap      --disable-libcap
+--enable-libselinux  --disable-libselinux
+--enable-liburing    --disable-liburing
+--enable-oniguruma   --disable-oniguruma
+

 
-    $ ./configure
-    $ make
-    $ ./configure RELEASE=y
-    $ make
+[`pkg-config`] is used, if available, to detect these libraries and any additional build flags they may require.
+If this is undesireable, disable it by setting `PKG_CONFIG` to the empty string (`./configure PKG_CONFIG=""`).
 
-will build the project in debug mode and then rebuild it in release mode.
+[`pkg-config`]: https://www.freedesktop.org/wiki/Software/pkg-config/
 
 ### Out-of-tree builds
 
@@ -110,6 +107,53 @@ You can set up an out-of-tree build by running the `configure` script from anoth
     $ make
 
 
+Building
+--------
+
+### Targets
+
+The [`Makefile`](/Makefile) supports several different build targets:
+
+
+make
+    The default target; builds just the bfs binary
+make all
+    Builds everything, including the tests (but doesn't run them)
+
+make check
+    Builds everything, and runs all tests
+make unit-tests
+    Builds and runs the unit tests
+make integration-tests
+    Builds and runs the integration tests
+make distcheck
+    Builds and runs the tests in multiple different configurations
+
+make install
+    Installs bfs globally
+make uninstall
+    Uninstalls bfs
+
+make clean
+    Deletes all built files
+make distclean
+    Also deletes files generated by ./configure
+

+
+
+Troubleshooting
+---------------
+
+If the build fails or behaves unexpectedly, start by enabling verbose mode:
+
+    $ ./configure V=1
+    $ make V=1
+
+This will print the generated configuration and the exact commands that are executed.
+
+You can also check the file `gen/config.log`, which contains any errors from commands run during the configuration phase.
+
+
 Testing
 -------
 
-- 
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