Building with the attached random configuration file,
net/built-in.o: In function `br_handle_frame_finish':
(.text+0x40edf): undefined reference to `arp_tbl'
net/built-in.o: In function `br_handle_frame_finish':
(.text+0x40f3a): undefined reference to `arp_send'
make: *** [vmlinux] Error 1