build: Make the config scripts POSIX-compliant

3 files changed, 17 insertions, 15 deletions

diff --git a/config/cc.sh b/config/cc.sh
index abce508..e6883f5 100755
--- a/config/cc.sh
+++ b/config/cc.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Copyright © Tavian Barnes <tavianator@tavianator.com>
 # SPDX-License-Identifier: 0BSD
diff --git a/config/pkg.sh b/config/pkg.sh
index 2ca533e..4ebea64 100755
--- a/config/pkg.sh
+++ b/config/pkg.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Copyright © Tavian Barnes <tavianator@tavianator.com>
 # SPDX-License-Identifier: 0BSD
@@ -7,10 +7,10 @@
 
 set -eu
 
-NAME="${1^^}"
-declare -n XUSE="USE_$NAME"
+NAME=$(printf '%s' "$1" | tr 'a-z' 'A-Z')
+eval "XUSE=\"\${USE_$NAME:-}\""
 
-if [ "${XUSE:-}" ]; then
+if [ "$XUSE" ]; then
     USE="$XUSE"
 elif config/pkgconf.sh "$1"; then
     USE=y
diff --git a/config/pkgconf.sh b/config/pkgconf.sh
index 361852e..d6c45c7 100755
--- a/config/pkgconf.sh
+++ b/config/pkgconf.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Copyright © Tavian Barnes <tavianator@tavianator.com>
 # SPDX-License-Identifier: 0BSD
@@ -8,20 +8,22 @@
 set -eu
 
 MODE=
-if [[ "${1:-}" == --* ]]; then
-    MODE="$1"
-    shift
-fi
+case "${1:-}" in
+    --*)
+        MODE="$1"
+        shift
+esac
 
-if (($# < 1)); then
+if [ $# -lt 1 ]; then
     exit
 fi
 
-if [[ "$XNOLIBS" == [y1] ]]; then
-    exit 1
-fi
+case "$XNOLIBS" in
+    y|1)
+        exit 1
+esac
 
-if command -v "${XPKG_CONFIG:-}" &>/dev/null; then
+if command -v "${XPKG_CONFIG:-}" >/dev/null 2>&1; then
     case "$MODE" in
         "")
             "$XPKG_CONFIG" "$@"