echo 'Creating brew-patch.diff'
cat << EOF >> brew-patch.diff
diff --git a/png2ico.cpp b/png2ico.cpp
index 8fb87e4..9dedb97 100644
--- a/png2ico.cpp
+++ b/png2ico.cpp
@@ -34,6 +34,7 @@ Notes about transparent and inverted pixels:
 #include <cstdio>
 #include <vector>
 #include <climits>
+#include <cstdlib>
 
 #if __GNUC__ > 2
 #include <ext/hash_map>
EOF