configure: Set PKG_CONFIG_PATH to get the right settings for the target host.

[Francois Gouget]

Ideally we would use the right <triplet>-pkg-config tool for the target
host. However Red Hat and SUSE respectively add '-redhat' and '-suse' to
the triplet which makes it hard to find the right tool. Furthermore on
Debian and derivatives a lot of development packages do not support
multiarch so that the required .pc files would not be found.

Setting PKG_CONFIG_PATH side-steps the non-standard Red Hat and SUSE
triplets. It also lets pkg-config fall back to the 'wrong' .pc files
on Debian which is fine in most cases, which using the right one in
cases where it matters (GStreamer 1.0), assuming they are actually
present.

Only set PKG_CONFIG_PATH when it won't interfere with cross-compiling.

Signed-off-by: Francois Gouget <fgouget at codeweavers.com>
---
 configure.ac | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/configure.ac b/configure.ac
index 71bf7ca2bf7..31649846480 100644
--- a/configure.ac
+++ b/configure.ac
@@ -151,6 +151,11 @@ case $host in
       host_cpu="i386"
       notice_platform="32-bit "
       AC_SUBST(TARGETFLAGS,"-m32")
+      if test "x$PKG_CONFIG_PATH" = "x"
+      then
+        PKG_CONFIG_PATH="/usr/lib/i386-linux-gnu/pkgconfig:/usr/lib/pkgconfig"
+        export PKG_CONFIG_PATH
+      fi
       enable_win16=${enable_win16:-yes}
     else
       if test "x${GCC}" = "xyes"
-- 
2.11.0