stunnel transparent proxying

I am trying to set up stunnel's transparent proxying feature (see http://www.stunnel.org/static/stunnel.html and look for "enable transparent proxy support on selected platforms").

This involves a number of iptables rules, including:

iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT

This gives the error "iptables: No chain/target/match by that name."

The error refers to the "-m socket" part of the rule. Is there any way to make this work on Linodes (I am using Debian 6 64bit) or is it not built into the kernel?