$OpenBSD: patch-configure,v 1.2 2012/04/27 14:33:23 gonzalo Exp $
--- configure.orig	Sun Feb 26 17:11:59 2012
+++ configure	Thu Apr 26 10:57:00 2012
@@ -587,7 +587,7 @@ if test "$_libpng" = auto ; then
 #include <png.h>
 int main(void) { return printf("%s\n", PNG_HEADER_VERSION_STRING); }
 EOF
-	cc_check $LDFLAGS $CXXFLAGS $LIBPNG_CFLAGS $LIBPNG_LIBS -lpng && _libpng=yes
+	cc_check $LDFLAGS $CXXFLAGS $LIBPNG_CFLAGS $LIBPNG_LIBS `pkg-config --libs libpng` && _libpng=yes
 fi
 if test "$_libpng" = yes ; then
 	echo "$_libpng"