--- a/traceroute/flowlabel.h	2006-10-03 16:44:02.000000000 +0200
+++ b/traceroute/flowlabel.h	2011-08-17 15:34:15.300974577 +0200
@@ -19,6 +19,8 @@ struct in6_flowlabel_req
 	/* Options in format of IPV6_PKTOPTIONS */
 };
 
+#define IPV6_TCLASS		67
+
 #define IPV6_FL_A_GET	0
 #define IPV6_FL_A_PUT	1
 #define IPV6_FL_A_RENEW	2