[Dovecot] Custom Debian package bulding

Hi

I am using Debian source packages from http://xi.rename-it.nl/debian/. When downloading dependencies, I have seen that the package requires MySQL, that I don't use. How could I remove this dependency or chanage them? Is that defined in any file?

However, I would like to use SQLite or Postgres to store dict data for the Expire plugin. Where should I enable these flags?

Thanks.