E.g.:
PHP Warning: Declaration of kolab_sync_logger::log($message, $method) should be compatible with Zend_Log::log($message, $priority, $extras = NULL) in /usr/share/kolab-syncroton/lib/kolab_sync_logger.php on line 28 PHP Warning: Declaration of kolab_sync_data_email::getObject($entryid, &$folder = NULL) should be compatible with kolab_sync_data::getObject($folderid, $entryid, &$folder = NULL) in /usr/share/kolab-syncroton/lib/kolab_sync_data_email.php on line 29
but there may be more.