From 0a21fd6641057e381a49e06000ee3d9909d55a45 Mon Sep 17 00:00:00 2001
From: Nick Bowler <nbowler@draconx.ca>
Date: Tue, 17 Mar 2009 21:53:58 -0400
Subject: [PATCH] Respect environment variables for PKG_CHECK_VAR.

---
 m4/pkgvar.m4 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/m4/pkgvar.m4 b/m4/pkgvar.m4
index 4b7fa9b..20a9a6a 100644
--- a/m4/pkgvar.m4
+++ b/m4/pkgvar.m4
@@ -10,7 +10,12 @@ See the pkg-config man page for more details.])
 
 pkg_fail=no
 AC_MSG_CHECKING([for $3])
-_PKG_CONFIG([$1][_$2], [variable=$2], [$4])
+if test -z "$[]m4_toupper([$1][_$2])"; then
+	_PKG_CONFIG([$1][_$2], [variable=$2], [$4])
+else
+	pkg_cv_$1[]_$2="$[]m4_toupper([$1][_$2])"
+fi
+
 if test -z "[$pkg_cv_$1][_$2]"; then
 	if test $pkg_failed = yes; then
 		_PKG_SHORT_ERRORS_SUPPORTED
-- 
2.43.0