+Debian does not allow complex dependencies. Upon install, you need to
+check that you have the correct packages installed.
+
+If you want to use MySQL, you need mysql-client, php4-mysql or
+php5-mysql. For PostgreSQL, you need postgresql-client, php4-pgsql or
+php5-pgsql. For SQLite, you need sqlite and php5-sqlite.
+
+From Roundcube documentation, php4-sqlite is not supported !
+
+For better compatibility, the schema used for MySQL is the one
+targeted at MySQL 4.0, not the one for MySQL 4.1 or MySQL 5.x.
+
+ -- Vincent Bernat <bernat@luffy.cx>, Tue, 22 May 2007 21:17:27 +0200