diff -Nru grafx2-2.3/debian/changelog grafx2-2.3/debian/changelog
--- grafx2-2.3/debian/changelog	2011-05-03 13:04:51.000000000 +0000
+++ grafx2-2.3/debian/changelog	2012-06-15 13:34:32.000000000 +0000
@@ -1,3 +1,12 @@
+grafx2 (2.3-1.1) unstable; urgency=low
+
+  * Non-maintainer upload.
+  * Fix "FTBFS: fileformats.c:30:17: fatal error: png.h: No such file or
+    directory": add build dependency on libpng-dev.
+    (Closes: #669433)
+
+ -- gregor herrmann <gregoa@debian.org>  Fri, 15 Jun 2012 15:34:23 +0200
+
 grafx2 (2.3-1) unstable; urgency=low
 
   * New upstream version.
diff -Nru grafx2-2.3/debian/control grafx2-2.3/debian/control
--- grafx2-2.3/debian/control	2011-05-03 13:04:34.000000000 +0000
+++ grafx2-2.3/debian/control	2012-06-15 13:33:54.000000000 +0000
@@ -2,7 +2,7 @@
 Section: x11
 Priority: optional
 Maintainer: Gürkan Sengün <gurkan@phys.ethz.ch>
-Build-Depends: debhelper (>= 8), libsdl1.2-dev, libsdl-image1.2-dev, libsdl-ttf2.0-dev, liblua5.1-0-dev, pkg-config
+Build-Depends: debhelper (>= 8), libsdl1.2-dev, libsdl-image1.2-dev, libsdl-ttf2.0-dev, liblua5.1-0-dev, libpng-dev, pkg-config
 Standards-Version: 3.9.2
 Homepage: http://code.google.com/p/grafx2/