depends on IP_NF_IPTABLES
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
-@@ -47,6 +47,7 @@
+@@ -50,6 +50,7 @@
obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
obj-$(CONFIG_IP_NF_MATCH_SET) += ipt_set.o