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$NetBSD: patch-ac,v 1.2 2011/01/29 23:01:50 wiz Exp $

Fix build with png-1.5.
http://plasma-gate.weizmann.ac.il/Grace/phpbb/viewtopic.php?f=3&t=2080&p=4606#p4606

--- src/rstdrv.c.orig	2004-07-03 20:47:46.000000000 +0000
+++ src/rstdrv.c
@@ -54,6 +54,7 @@
 
 #ifdef HAVE_LIBPNG
 #  include <png.h>
+#  include <zlib.h>
 #endif
 
 #ifndef NONE_GUI
@@ -885,7 +886,7 @@ static void rstImagePng(gdImagePtr ihand
         return;
     }
 
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_write_struct(&png_ptr, &info_ptr);
         return;
     }