make -C /lib/modules/4.5.0-pinguin20160314/build M=/home/ingo/src/linux/pkt_cls-bug modules
make[1]: Entering directory '/usr/src/linux-headers-4.5.0-pinguin20160314'
  CC [M]  /home/ingo/src/linux/pkt_cls-bug/fail.o
In file included from include/linux/filter.h:16:0,
                 from include/net/sock.h:64,
                 from include/linux/tcp.h:22,
                 from include/linux/ipv6.h:72,
                 from include/net/ipv6.h:16,
                 from /home/ingo/src/linux/pkt_cls-bug/fail.c:1:
include/net/sch_generic.h: In function ‘skb_at_tc_ingress’:
include/net/sch_generic.h:413:9: error: implicit declaration of function ‘G_TC_AT’ [-Werror=implicit-function-declaration]
  return G_TC_AT(skb->tc_verd) & AT_INGRESS;
         ^
include/net/sch_generic.h:413:33: error: ‘AT_INGRESS’ undeclared (first use in this function)
  return G_TC_AT(skb->tc_verd) & AT_INGRESS;
                                 ^
include/net/sch_generic.h:413:33: note: each undeclared identifier is reported only once for each function it appears in
cc1: some warnings being treated as errors
scripts/Makefile.build:264: recipe for target '/home/ingo/src/linux/pkt_cls-bug/fail.o' failed
make[2]: *** [/home/ingo/src/linux/pkt_cls-bug/fail.o] Error 1
Makefile:1391: recipe for target '_module_/home/ingo/src/linux/pkt_cls-bug' failed
make[1]: *** [_module_/home/ingo/src/linux/pkt_cls-bug] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.5.0-pinguin20160314'
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 2