$OpenBSD$

this is fine, wordexp isn't even needed here.

--- src/sound/i_music.cpp.orig	Fri Dec 28 21:11:27 2012
+++ src/sound/i_music.cpp	Fri Dec 28 21:37:21 2012
@@ -44,7 +44,9 @@
 #include <fcntl.h>
 #include <signal.h>
 #include <unistd.h>
+#if !defined(__OpenBSD__)
 #include <wordexp.h>
+#endif
 #include <stdio.h>
 #include "mus2midi.h"
 #define FALSE 0