--- worldofpadman-1.6.2/code/qcommon/ioapi.h
+++ worldofpadman-1.6.2/code/qcommon/ioapi.h
@@ -29,6 +29,10 @@
 #endif
 #endif
 
+#ifndef OF /* function prototypes */
+# define OF(args)  args
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif