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+# Copyright © Tavian Barnes <tavianator@tavianator.com>
+# 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}