--- a/src/unzip/ioapi.h		2013-09-26 03:13:13.407118417 -0400
+++ b/src/unzip/ioapi.h		2013-09-26 03:13:54.377734249 -0400
@@ -31,6 +31,12 @@
 #endif
 #endif
 
+#if PRE_ANSI_C89 
+#  define OF(args) () 
+#else 
+#  define OF(args) args 
+#endif 
+
 #ifdef __cplusplus
 extern "C" {
 #endif