BK-current build breakage

net/built-in.o(.text+0x25858): In function `tcf_ipt_init':
net/sched/ipt.c:63: undefined reference to `__ipt_find_target_lock'
net/built-in.o(.text+0x25873):net/sched/ipt.c:78: undefined reference to 
`__ipt_mutex_up'
make: *** [.tmp_vmlinux1] Error 1