hermes:/usr/src/linux-2.6.23.9# make modules
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  CALL    scripts/checksyscalls.sh
  Building modules, stage 2.
  MODPOST 1659 modules
ERROR: "ip_ct_attach" [net/netfilter/nf_conntrack.ko] undefined!
ERROR: "nf_ct_destroy" [net/netfilter/nf_conntrack.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/netfilter/nf_conntrack.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv6/sit.ko] undefined!
ERROR: "nf_ct_attach" [net/ipv6/netfilter/ip6t_REJECT.ko] undefined!
ERROR: "nf_ct_attach" [net/ipv6/ipv6.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv6/ipv6.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv6/ip6_tunnel.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv4/netfilter/nf_conntrack_ipv4.ko] undefined!
ERROR: "nf_ct_attach" [net/ipv4/netfilter/ipt_REJECT.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv4/netfilter/ipt_REJECT.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv4/ipip.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv4/ip_gre.ko] undefined!
make[1]: *** [__modpost] Error 1