Fix for some older installs that don't have the PDO::* constants.

conf/config-defaults.php

@@ -13,7 +13,7 @@
 $Configuration['Database']['User']                             = 'dbuser';
 $Configuration['Database']['Password']                         = '';
 $Configuration['Database']['ConnectionOptions']                = array(
-                                                                  PDO::ATTR_PERSISTENT => FALSE,
+                                                                  12 => FALSE, //PDO::ATTR_PERSISTENT => FALSE,
                                                                   1000 => TRUE, // PDO::MYSQL_ATTR_USE_BUFFERED_QUERY is missing in some php installations
                                                                   1002 => "set names 'utf8'" // PDO::MYSQL_ATTR_INIT_COMMAND is missing in PHP 5.3, so I use the actual value "1002" instead
                                                                );