[Dovecot] Using dovecot with vpopmail and mysql auth?

Hi,

Does anyone happen to know the right strings to do authentication against mysql storing vpopmail data, vs using the vpopmail auth module?

I'm trying to get up to both vpopmail 5.5, and dovecot 2.0, and dovecot-auth seems to reliably segfault on the 5.5 vpopmail module.
I've tried downgrading vpopmail as well, with less than stellar results.

I saw an old article about doing exactly that -- switching from the vpop module, while still using it's DB, but it is both a) old, and b) confusing.

Any help you can offer -- or urls in a pinch -- would be appreciated.