$NetBSD: patch-ab,v 1.4 2011/01/27 00:00:58 wiz Exp $

Fix build with png-1.5.
Accepted upstream in
https://github.com/ldo/dvdauthor/commit/c82aaa4eb1a1c36bf7e2b7ae3c9140d0bf8000b5

--- src/spuunmux.c.orig	2010-03-05 06:37:06.000000000 +0000
+++ src/spuunmux.c
@@ -39,6 +39,7 @@
 #include <netinet/in.h>
 
 #include <png.h>
+#include <zlib.h>
 
 #include "rgb.h"
 #include "common.h"
@@ -610,7 +611,7 @@
         png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
         return -1;
       } /*if*/
-    if (setjmp(png_ptr->jmpbuf))
+    if (setjmp(png_jmpbuf(png_ptr)))
       {
         png_destroy_write_struct(&png_ptr, &info_ptr);
         fclose(fp);