Description of problem:
arptables_jf fails to build in mock.

Version-Release number of selected component (if applicable):
arptables_jf-0.0.8-6.2.1.src.rpm

Build fails with error:
In file included from arp_tables.h:20,
                 from common.h:14,
                 from arptables.h:4,
                 from arptables.c:40:
netfilter_arp.h:8:26: error: linux/config.h: No such file or directory