From 72b0326c20d353eb8d59a85f63bb5701e8c85bc7 Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Sat, 23 Mar 2013 19:04:41 +1100
Subject: [PATCH] check if IPV6_TCLASS is defined

---
 lib/isc/unix/socket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index d38d6e3cdf..77c06fd80c 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -1526,7 +1526,7 @@ build_msghdr_send(isc__socket_t *sock, isc_socketevent_t *dev,
 			}
 		}
 #endif
-#ifdef IPPROTO_IPV6
+#if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS)
 		if (sock->pf == AF_INET6 &&
 		    ((isc_net_probedscp() & ISC_NET_DSCPPKTV6) != 0))
 		{