deb repo with dovecot-antispam ?

[Håkon Alstadheim]

There are .debs available for version 2.2 both from backports and
ix.dovecot.fi, but neither seem to have the antispam plugin built for
version 2.2. Anybody know why, and (if there is no particular reason)
how to get dovecot-antispam in a proper .deb package for dovecot-2.2.* ?