Index: dhcpcd-6.9.4/ipv6.c
===================================================================
--- dhcpcd-6.9.4.orig/ipv6.c	2015-11-30 21:01:02.000000000 +0530
+++ dhcpcd-6.9.4/ipv6.c	2015-12-07 11:10:51.386334601 +0530
@@ -85,6 +85,12 @@
 #endif
 
 #ifdef __linux__
+
+/* Hack for older kernels. It should never trigger these branches */
+#ifndef IFA_F_DADFAILED
+#define IFA_F_DADFAILED            0x08
+#endif
+
    /* Match Linux defines to BSD */
 #  define IN6_IFF_TEMPORARY IFA_F_TEMPORARY
 #  ifdef IFA_F_OPTIMISTIC