randconfig build error with next-20141125, in drivers/net/ipvlan

Building with the attached random configuration file,

In file included from drivers/net/ipvlan/ipvlan.h:27:0,
                 from drivers/net/ipvlan/ipvlan_core.c:10:
include/net/gre.h: In function ‘gre_handle_offloads’:
include/net/gre.h:42:2: error: implicit declaration of function
‘iptunnel_handle_offloads’ [-Werror=implicit-function-declaration]
  return iptunnel_handle_offloads(skb, csum,
  ^
include/net/gre.h:42:2: warning: return makes pointer from integer
without a cast [enabled by default]
drivers/net/ipvlan/ipvlan_core.c: In function ‘ipvlan_process_v6_outbound’:
drivers/net/ipvlan/ipvlan_core.c:379:2: error: implicit declaration of function
‘ip6_route_output’ [-Werror=implicit-function-declaration]
  dst = ip6_route_output(dev_net(dev), NULL, &fl6);
  ^
drivers/net/ipvlan/ipvlan_core.c:379:6: warning: assignment makes
pointer from integer without a cast [enabled by default]
  dst = ip6_route_output(dev_net(dev), NULL, &fl6);
      ^
  CC [M]  drivers/mtd/mtdblock_ro.o
cc1: some warnings being treated as errors
make[3]: *** [drivers/net/ipvlan/ipvlan_core.o] Error 1