--- a/src/unzip/ioapi.h	2004-12-19 14:51:32.000000000 +0100
+++ b/src/unzip/ioapi.h	2012-01-11 18:07:59.570768250 +0100
@@ -35,6 +35,16 @@
 extern "C" {
 #endif
 
+/* Work-around for NetBSD. Its zconf.h doesn't define OF(x) */
+#ifndef OF
+#ifdef __STDC__
+#define OF(x) x
+#else
+#define OF(x) ()
+#endif
+#endif
+
+
 typedef voidpf (ZCALLBACK *open_file_func) OF((voidpf opaque, const char* filename, int mode));
 typedef uLong  (ZCALLBACK *read_file_func) OF((voidpf opaque, voidpf stream, void* buf, uLong size));
 typedef uLong  (ZCALLBACK *write_file_func) OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
--- a/src/unzip/unzip.h 2004-12-19 14:51:32.000000000 +0100
+++ b/src/unzip/unzip.h 2012-01-11 18:00:25.988120225 +0100
@@ -47,6 +47,15 @@
 extern "C" {
 #endif
 
+/* Work-around for NetBSD. Its zconf.h doesn't define OF(x) */
+#ifndef OF
+#ifdef __STDC__
+#define OF(x) x
+#else
+#define OF(x) ()
+#endif
+#endif
+
 #ifndef _ZLIB_H
 #include "../zlib/zlib.h"
 #endif