Zend Framework on 000webhost: library-path in index and bootstrap

// it seems absolute path is needed

// index.php:
ini_set('include_path', ini_get('include_path').':/home/a*******/library/:');

// bootstrap:
// it seems ROOT_DIR or $rootDir = dirname(dirname(__FILE__));
// not recognized
// Use absolute path instead


//            . PATH_SEPARATOR . ROOT_DIR . '/library/'
//            . PATH_SEPARATOR . ROOT_DIR . '/application/models/'
            . PATH_SEPARATOR . '/home/a********/library/'
            . PATH_SEPARATOR . '/home/a ******** /application/models/'