--- calibre/src/calibre/ebooks/pdf/images.cpp.orig	2012-12-23 13:03:09.695517787 +0100
+++ calibre/src/calibre/ebooks/pdf/images.cpp	2012-12-23 13:03:25.011366729 +0100
@@ -16,6 +16,7 @@
 
 #include "images.h"
 #include "utils.h"
+#include <zlib.h>
 
 #ifdef _WIN32
 inline double round(double x) { return (x-floor(x))>0.5 ? ceil(x) : floor(x); }