[PATCH 3/3] mtd-utils: make sure pkg-config is installed in configure script

[David Oberhollenzer]

This patch adds a check to configure.ac that tests if pkg-config
is available on the system.

Signed-off-by: David Oberhollenzer <david.oberhollenzer at sigma-star.at>
---
 configure.ac | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/configure.ac b/configure.ac
index 1ac45c7..f5538a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,15 @@ AC_DISABLE_STATIC
 AC_PROG_CC
 AC_PROG_INSTALL
 
+
+m4_ifndef([PKG_PROG_PKG_CONFIG],
+  [m4_fatal([Could not locate the pkg-config autoconf
+    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. Make sure pkg-config is installed.])])
+PKG_PROG_PKG_CONFIG
+
 ## compiler warnings
 UL_WARN_ADD([-Wall])
 UL_WARN_ADD([-Wextra])
-- 
2.17.0