diff -r fc774f445e10 -r ae6e6b73333f include/SDL_syswm.h
--- a/include/SDL_syswm.h	Sat Jul 07 23:27:29 2001 +0000
+++ b/include/SDL_syswm.h	Sun Jul 08 09:00:06 2001 +0000
@@ -49,7 +49,7 @@
 #else
 
 /* This is the structure for custom window manager events */
-#if (defined(unix) || defined(__unix__) || defined(_AIX)) && \
+#if (defined(unix) || defined(__unix__) || defined(_AIX) || defined(__OpenBSD__)) && \
     (!defined(DISABLE_X11) && !defined(__CYGWIN32__))
  /* AIX is unix, of course, but the native compiler CSet doesn't define unix */
 #include <X11/Xlib.h>