--- exim-4.82/src/ip.c~	2013-10-25 02:46:27.000000000 +0200
+++ exim-4.82/src/ip.c	2014-05-15 11:33:48.683945055 +0200
@@ -468,6 +468,9 @@
 else if (af == AF_INET6)
   {
   *level = IPPROTO_IPV6;
+#ifndef IPV6_TCLASS
+#define IPV6_TCLASS 67
+#endif
   *optname = IPV6_TCLASS;
   }
 #endif