diff -Nru leptonlib-1.68/debian/changelog leptonlib-1.68/debian/changelog
--- leptonlib-1.68/debian/changelog	2011-04-14 14:30:34.000000000 +0900
+++ leptonlib-1.68/debian/changelog	2011-08-07 15:05:23.000000000 +0900
@@ -1,3 +1,10 @@
+leptonlib (1.68-4.1) unstable; urgency=low
+
+  * Non-maintainer upload.
+  * libpng 1.5 transition.
+
+ -- Nobuhiro Iwamatsu <iwamatsu@debian.org>  Sun, 07 Aug 2011 15:04:47 +0900
+
 leptonlib (1.68-4) unstable; urgency=low
 
   * Add webp support
diff -Nru leptonlib-1.68/debian/control leptonlib-1.68/debian/control
--- leptonlib-1.68/debian/control	2011-04-14 14:18:12.000000000 +0900
+++ leptonlib-1.68/debian/control	2011-08-07 15:08:58.000000000 +0900
@@ -1,7 +1,7 @@
 Source: leptonlib
 Priority: optional
 Maintainer: Jeff Breidenbach <jab@debian.org>
-Build-Depends: debhelper (>= 5.0.0), libtiff4-dev (>= 3.7.4), libpng12-dev, libgif-dev (>= 4.1.6), libwebp-dev
+Build-Depends: debhelper (>= 5.0.0), libtiff4-dev (>= 3.7.4), libpng12-dev | libpng-dev, libgif-dev (>= 4.1.6), libwebp-dev
 Standards-Version: 3.8.4
 Section: graphics
 
diff -Nru leptonlib-1.68/debian/patches/debian-changes-1.68-4.1 leptonlib-1.68/debian/patches/debian-changes-1.68-4.1
--- leptonlib-1.68/debian/patches/debian-changes-1.68-4.1	1970-01-01 09:00:00.000000000 +0900
+++ leptonlib-1.68/debian/patches/debian-changes-1.68-4.1	2011-08-07 15:09:01.000000000 +0900
@@ -0,0 +1,38 @@
+Description: Upstream changes introduced in version 1.68-4.1
+ This patch has been created by dpkg-source during the package build.
+ Here's the last changelog entry, hopefully it gives details on why
+ those changes were made:
+ .
+ leptonlib (1.68-4.1) unstable; urgency=low
+ .
+   * Non-maintainer upload.
+   * libpng 1.5 transition.
+ .
+ The person named in the Author field signed this changelog entry.
+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>
+
+--- leptonlib-1.68.orig/src/pngio.c
++++ leptonlib-1.68/src/pngio.c
+@@ -107,6 +107,9 @@
+ /* --------------------------------------------*/
+ 
+ #include "png.h"
++#if PNG_LIBPNG_VER_MAJOR >= 1 && PNG_LIBPNG_VER_MINOR >= 4
++#  include <zlib.h>
++#endif
+ 
+ /* ----------------Set defaults for read/write options ----------------- */
+     /* strip 16 bpp --> 8 bpp on reading png; default is for stripping */
diff -Nru leptonlib-1.68/debian/patches/series leptonlib-1.68/debian/patches/series
--- leptonlib-1.68/debian/patches/series	1970-01-01 09:00:00.000000000 +0900
+++ leptonlib-1.68/debian/patches/series	2011-08-07 15:09:01.000000000 +0900
@@ -0,0 +1 @@
+debian-changes-1.68-4.1