$NetBSD$

--- third-party/libutp/utp.h.orig	2011-06-29 01:14:43.410704000 +0000
+++ third-party/libutp/utp.h
@@ -13,6 +13,7 @@
 #else
 #include <stdlib.h>
 #include <sys/socket.h>
+#include <netinet/in.h>
 #include <arpa/inet.h>
 #endif
 
