Randy Dunlap [off-list ref] wrote:

/opt/crosstool/gcc-13.2.0-nolibc/powerpc-linux/bin/powerpc-linux-ld: net/ipv4/netfilter/arp_tables.o: in function `arpt_unregister_table_pre_exit':
arp_tables.c:(.text+0x20): undefined reference to `xt_find_table'

Thanks for reporting, original Kconfig had a 'select' for X_TABLES which
isn't there anymore.  I'll send a followup patch.