nf_unregister_sockopt?

[SHIBUYA Katsutoshi]

Hi.
I downloaded kernel source code for 2.4.24 from www.kernel.org.
I compiled and installed it, and it works well except iptables.
While iptables service goes on, it fails saying;

/lib/modules/2.4.24/kernel/net/ipv4/netfilter/ip_tables.o: unresolved 
symbol nf_unregister_sockopt
/lib/modules/2.4.24/kernel/net/ipv4/netfilter/ip_tables.o: unresolved 
symbol nf_register_sockopt
/lib/modules/2.4.24/kernel/net/ipv4/netfilter/ip_tables.o: insmod 
/lib/modules/2.4.24/kernel/net/ipv4/netfilter/ip_tables.o failed
/lib/modules/2.4.24/kernel/net/ipv4/netfilter/ip_tables.o: insmod 
ip_tables failed

It looks like I have to include something in my kernel, but I can't 
find it.
Does anyone know it?
---
SHIBUYA Katsutoshi (shibuya at bu-denken.co.jp)