compile kernel error under 8.10

[loody]

Dear all:
I use ubuntu 8.10 and try to compile kernel by my self.
But I have the error message appended at the end of letter.
Did I miss any file?
appreciate your help,
miloody

kernel/built-in.o: In function `audit_send_reply_thread':
/home/harry/work/linux-source-2.6.27/kernel/audit.c:545: undefined
reference to `netlink_unicast'
kernel/built-in.o: In function `audit_send_list':
/home/harry/work/linux-source-2.6.27/kernel/audit.c:488: undefined
reference to `netlink_unicast'
kernel/built-in.o: In function `audit_buffer_free':
/home/harry/work/linux-source-2.6.27/kernel/audit.c:1022: undefined
reference to `kfree_skb'
kernel/built-in.o: In function `alloc_skb':
/home/harry/work/linux-source-2.6.27/include/linux/skbuff.h:363:
undefined reference to `__alloc_skb'
kernel/built-in.o: In function `__nlmsg_put':
/home/harry/work/linux-source-2.6.27/include/linux/netlink.h:239:
undefined reference to `skb_put'
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