diff -Nru dvdisaster-0.72.3/debian/patches/libpng15 dvdisaster-0.72.3/debian/patches/libpng15
--- dvdisaster-0.72.3/debian/patches/libpng15	1970-01-01 09:00:00.000000000 +0900
+++ dvdisaster-0.72.3/debian/patches/libpng15	2012-03-19 08:49:28.000000000 +0900
@@ -0,0 +1,38 @@
+Description: <short summary of the patch>
+ TODO: Put a short summary on the line above and replace this paragraph
+ with a longer explanation of this change. Complete the meta-information
+ with other relevant fields (see below for details). To make it easier, the
+ information below has been extracted from the changelog. Adjust it or drop
+ it.
+ .
+ dvdisaster (0.72.3-1+libpng151) unstable; urgency=low
+ .
+   * Build with libpng15.
+Author: Nobuhiro Iwamatsu <iwamatsu@debian.org>
+
+---
+The information above should follow the Patch Tagging Guidelines, please
+checkout http://dep.debian.net/deps/dep3/ to learn about the format. Here
+are templates for supplementary fields that you might want to add:
+
+Origin: <vendor|upstream|other>, <url of original patch>
+Bug: <url in upstream bugtracker>
+Bug-Debian: http://bugs.debian.org/<bugnumber>
+Bug-Ubuntu: https://launchpad.net/bugs/<bugnumber>
+Forwarded: <no|not-needed|url proving that it has been forwarded>
+Reviewed-By: <name and email of someone who approved the patch>
+Last-Update: <YYYY-MM-DD>
+
+--- dvdisaster-0.72.3.orig/tools/pngio.h
++++ dvdisaster-0.72.3/tools/pngio.h
+@@ -21,6 +21,10 @@
+ #define PNGIO_H
+ 
+ #include <png.h>
++#if PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 4
++  #include <zlib.h>
++#endif
++
+ 
+ typedef struct
+ {  char *name;