build-sys: extend "Could not locate the pkg-config" error message

Addresses: https://github.com/karelzak/util-linux/issues/631
Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/configure.ac b/configure.ac
index 3ad35abecfa218dec19155bbd2b80a41a255b611..7999c4e6aaf5f261f7962faa4aaaa0fd2ba5d50f 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -164,7 +164,7 @@ m4_ifndef([PKG_PROG_PKG_CONFIG],
     macros. These are usually located in /usr/share/aclocal/pkg.m4.
     If your macros are in a different location, try setting the
     environment variable AL_OPTS="-I/other/macro/dir" before running
-    ./autogen.sh or autoreconf again.])])
+    ./autogen.sh or autoreconf again. Make sure pkg-config is installed.])])
 PKG_PROG_PKG_CONFIG
 
 GTK_DOC_CHECK([1.10])