diff -Naur poppler-0.16.0/goo/PNGWriter.cc poppler-0.16.0-magellan/goo/PNGWriter.cc
--- poppler-0.16.0/goo/PNGWriter.cc	2010-07-24 01:18:28.000000000 +0200
+++ poppler-0.16.0-magellan/goo/PNGWriter.cc	2011-01-12 14:47:16.000000000 +0100
@@ -13,6 +13,7 @@
 //========================================================================
 
 #include "PNGWriter.h"
+#include <zlib.h>
 
 #ifdef ENABLE_LIBPNG