Regarding database availability:

Prior to version 0.9.0, SQLite support was disabled in the Mageia package
because Roundcube required the SQLite2-compatible mainline PHP SQLite extension.
As of version 1.0.0, according to upstream, this still doesn't work

Thomas Spuhler
2014-04-08

Additional installation and update information:

WARNING: when upgrading from <= 0.9.5 the old configuration files named main.inc.php 
and db.inc.php are now deprecated and should be replaced with one single 
config.inc.php file. Run the ./bin/update.sh script to get this conversion 
done or manually merge the files. NOTE: the new config.inc.php should only 
contain options that differ from the ones listed in defaults.inc.php.

The Roundcube installer is not included in the Mageia package, as its method of
operation is not compatible with distribution packaging.

Thomas Spuhler
2014-04-08