--- a/include/unzip.h.old	2012-03-24 16:13:16.012854948 +0100
+++ b/include/unzip.h	2012-03-24 16:15:42.744346771 +0100
@@ -49,6 +49,10 @@
 #include "zlib.h"
 #endif
 
+#ifdef _Z_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 */