--- linux-2.6.13.1/net/ipv4/netfilter/ip_tables.c	2010-09-11 11:38:16.000000000 +0200
+++ linux-2.6.13.1/net/ipv4/netfilter/ip_tables.c	2010-09-11 11:37:50.000000000 +0200
@@ -1935,6 +1935,7 @@
 #endif
 
 	printk("ip_tables: (C) 2000-2002 Netfilter core team\n");
+	printk("ip_tables: compiled with sizeof(struct sk_buff) = %d\n", sizeof(struct sk_buff));
 	return 0;
 }