$OpenBSD: patch-src_vim_h,v 1.6 2016/03/02 11:54:29 sthen Exp $
--- src/vim.h.orig	Mon Feb 29 22:12:49 2016
+++ src/vim.h	Tue Mar  1 18:27:49 2016
@@ -276,6 +276,7 @@
   && !defined(MACOS_X) /* MACOS_X doesn't yet support osdef.h */
 # include "auto/osdef.h"	/* bring missing declarations in */
 #endif
+#define UNUSED __attribute__((unused))
 
 #ifdef __EMX__
 # define    getcwd  _getcwd2
