Drux doesn't work with Drush 5

It seems drush_invoke_process_args() was removed from Drush 5 api, so drush dep-en cannot work anymore.

lib/ExtensionInfo.php line 194
$result = drush_invoke_process_args('pm-download', array_keys($projects), array('y' => TRUE));
should be replaced with
$result = drush_invoke_process('@self','pm-download', $projects, array('y' => TRUE));