commit 2d1b96596db6ad44df715097fe97b100ebae720e
parent 228099dc232fcf04652f2c3da726c27a17881572
Author: Florian Dold <florian@dold.me>
Date: Tue, 28 Oct 2025 12:18:12 +0100
aclocal.m4
Diffstat:
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/aclocal.m4 b/aclocal.m4
@@ -68,8 +68,8 @@ m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
[m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
])dnl PKG_PREREQ
-dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
-dnl ----------------------------------
+dnl PKG_PROG_PKG_CONFIG([MIN-VERSION], [ACTION-IF-NOT-FOUND])
+dnl ---------------------------------------------------------
dnl Since: 0.16
dnl
dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
@@ -77,6 +77,12 @@ dnl first found in the path. Checks that the version of pkg-config found
dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
dnl used since that's the first version where most current features of
dnl pkg-config existed.
+dnl
+dnl If pkg-config is not found or older than specified, it will result
+dnl in an empty PKG_CONFIG variable. To avoid widespread issues with
+dnl scripts not checking it, ACTION-IF-NOT-FOUND defaults to aborting.
+dnl You can specify [PKG_CONFIG=false] as an action instead, which would
+dnl result in pkg-config tests failing, but no bogus error messages.
AC_DEFUN([PKG_PROG_PKG_CONFIG],
[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
@@ -97,6 +103,9 @@ if test -n "$PKG_CONFIG"; then
AC_MSG_RESULT([no])
PKG_CONFIG=""
fi
+fi
+if test -z "$PKG_CONFIG"; then
+ m4_default([$2], [AC_MSG_ERROR([pkg-config not found])])
fi[]dnl
])dnl PKG_PROG_PKG_CONFIG
