I remember someone fixing it, but couldn't find the patch.
FWIW:
--- 2.4.20/include/linux/netfilter_ipv4/ip_conntrack.h 2002-08-13 06:01:49.000000000 +0200
+++ 2.4.20+/include/linux/netfilter_ipv4/ip_conntrack.h 2002-11-29 17:09:16.000000000 +0100
@@ -148,7 +148,8 @@ struct ip_conntrack_expect
union ip_conntrack_expect_help help;
};
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+struct ip_conntrack_helper;
+
struct ip_conntrack
{
/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
-
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