I might have used extras-devel, but at least extras-testing.

Config (/etc/aiccu.conf):
username xxxx-SIXXS
password xxxxxx
protocol tic
server tic.sixxs.net
ipv6_interface sixxs
tunnel_id Txxxx
verbose true
daemonize true
automatic true
requiretls false

I start it by hand, but you could write a script to do it automatically using /etc/network/interfaces and the post-up command. I'm discussing with SixXS whether or not they want it in their download section.