Newer versions of OpenWRT Kamikaze omit the latest versions of Quagga for some reason, so at work I've been using the 8.09 version on my company routers. However, newer versions of tinc haven't worked: fortunately, some hackers published tinc 1.0.11 that works on 8.09 for use with ChaosNET.
*EDIT 2-14-2010: the porter was kind enough to update tinc to 1.0.12 @ my request.
On your OpenWRT router (first run df & make sure you have space to use)...
opkg install tinc_1.0.12-1_mipsel.ipk
I have his old binary mirrored @ http://unquietwiki.com/savedutils/tinc_1.0.11-1_mipsel.ipk