Upgrading Roundcube Lion Server 10.7.3 PostgresSQL

Since webmail never worked solid on my Lion Server 10.7.3, like the rest of Lion server except for Mail, I'd like to update Roundcube 0.7.2. Thing is that during the upgrading proces I don't know what database, username for the database and password I should enter, although the database would be roundcubemail I believe. And then there is the kind of database for which roundcube installer gives me a few options like MySQL, but no PostgresSQL to choose from...

Needless to say that after downloading, unpacking and adjusting the two folders to be readable and writable for the web user (www) I'm basically stuck.

That's why I'd like to ask if someone here would be so kind as to hlep me out.

regards,

Mark

p.s. I have run the 10.7.3 combo update yesterday hoping that would help a bit with PostgreSQL.

p.p.s. I do hope that 10.8 does not have any problems so I can forget about Lion.