This message means, that your PHP does not provide SQL support. As far as I know, SQLite is only available with PHP5.
Use phpinfo() to get details about your PHP installation and the included extensions.
Thomas
indeed, and I got it to work with mysql properly afterwards without problems, however I don't like mysql running just for roundcube, so tossed it and tried php5.
After switching to php5 (no mysql), the result is evenly miserable:
DB Error in /var/roundcubemail/program/include/rcube_db.inc (63): DB Error: no database selected Fatal error: Call to undefined method DB_Error::query() in /var/roundcubemail/program/include/rcube_db.inc on line 124
the sqlite db is initialized and found properly, and writeable.
Auke