$OpenBSD$
--- applications/present3D/Cluster.cpp.orig	Tue Mar  2 14:17:33 2010
+++ applications/present3D/Cluster.cpp	Tue Mar  2 14:17:56 2010
@@ -33,7 +33,7 @@
 #if defined(__linux)
     #include <unistd.h>
     #include <linux/sockios.h>
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)
     #include <unistd.h>
     #include <sys/sockio.h>
 #elif defined(__sgi)