--- io/unzip.h.old	2011-09-21 12:13:28.911668053 +0200
+++ io/unzip.h	2011-09-21 12:14:53.074658064 +0200
@@ -57,6 +57,10 @@
 #include "zlib.h"
 #endif
 
+#ifndef OF
+#define OF _Z_OF
+#endif
+
 #if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
 /* like the STRICT of WIN32, we define a pointer that cannot be converted
     from (void*) without cast */