--- OpenImageIO-oiio-7d98ca6/src/ico.imageio/icooutput.cpp~	2011-11-05 08:35:00.000000000 +0100
+++ OpenImageIO-oiio-7d98ca6/src/ico.imageio/icooutput.cpp	2012-02-12 14:02:32.104659425 +0100
@@ -31,6 +31,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cmath>
+#include <zlib.h>
 
 #include "ico.h"
 #include "../png.imageio/png_pvt.h"