$OpenBSD: patch-mono_utils_networking-posix_c,v 1.1 2016/10/31 11:45:07 robert Exp $
--- mono/utils/networking-posix.c.orig	Mon Oct 31 11:41:26 2016
+++ mono/utils/networking-posix.c	Mon Oct 31 11:41:37 2016
@@ -17,6 +17,7 @@
 #include <sys/ioctl.h>
 #endif
 #ifdef HAVE_NET_IF_H
+#include <sys/socket.h>
 #include <net/if.h>
 #endif
 #ifdef HAVE_UNISTD_H
