iptables does not seem to be able to have ROUTE compiled in

[pdxdave]

I'm trying to get a statement of the form

iptables -A POSTROUTING -t mangle -p icmp -j ROUTE --oif eth1

to work (that example is from the netfilter website)
(ROUTE in the example will force all outbound icmp packets to eth1)

I'm getting an error that after some research indicates that "ROUTE" is not compiled in

I've got all the netfilter parameters in menuconfig selected.

what else do I have to enable?

I have iptables 1.2.11-r3 and linux 2.6.11-gentoo-r9

other than this, iptables seems to work