Without this patch (to 2.6.6 kernel) it is not possible to compile ipv6 as
a module additionaly, after the compilation of kernel and modules, because
functions from random.c being used by ipv6 code are not compiled (and random.c
is almost always in kernel, not as a module, so recompiling whole kernel is a 
must). There is the same thing with IPv4 and there are not those silly ifdefs
around those functions, I don't see a reason why there should be for v6.

		- JiKos

UPDATE: this is not sufficient. I will work on it later

--- drivers/char/random.c.old	Mon May 10 04:32:00 2004
+++ drivers/char/random.c	Thu May 20 23:58:27 2004
@@ -2146,8 +2146,6 @@
 	/* Alternative: return sum of all words? */
 }
 
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-
 static __u32 twothirdsMD4Transform (__u32 const buf[4], __u32 const in[12])
 {
 	__u32	a = buf[0], b = buf[1], c = buf[2], d = buf[3];
@@ -2197,7 +2195,6 @@
 	return buf[1] + b;	/* "most hashed" word */
 	/* Alternative: return sum of all words? */
 }
-#endif
 
 #undef ROUND
 #undef F
@@ -2271,7 +2268,6 @@
 	return keyptr;
 }
 
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 __u32 secure_tcpv6_sequence_number(__u32 *saddr, __u32 *daddr,
 				   __u16 sport, __u16 dport)
 {
@@ -2309,7 +2305,6 @@
 }
 
 EXPORT_SYMBOL(secure_ipv6_id);
-#endif
 
 
 __u32 secure_tcp_sequence_number(__u32 saddr, __u32 daddr,