$NetBSD: patch-ab,v 1.3 2011/01/31 21:20:11 wiz Exp $

Fix build with png-1.5.

--- tools/pngpack.c.orig	2006-09-09 12:14:09.000000000 +0000
+++ tools/pngpack.c
@@ -46,6 +46,7 @@
 
 #include <bzlib.h>
 #include <png.h>
+#include <zlib.h>
 
 #include "md5.h"
 
