$OpenBSD: patch-configure,v 1.1 2011/05/29 14:05:15 jsg Exp $
--- configure.orig	Sun May 29 14:18:48 2011
+++ configure	Sun May 29 14:20:00 2011
@@ -338,6 +338,9 @@ EOF
 	fi
 done # for parm in ...
 
+PNG_CFLAGS=$(pkg-config --cflags libpng)
+PNG_LIBS=$(pkg-config --libs libpng)
+
 for ac_option in $@; do
 	case "$ac_option" in
 	--enable-vorbis)          _vorbis=yes     ;;
