static function ListFiles($list_file, &$list, &$css_file_name ){

		$list = explode("\n",file_get_contents($list_file));

		//pop the cached name that should match $compiled_name
		$css_file_name = array_pop($list);

		if( !preg_match('/^' . Less_Cache::$prefix . '[a-f0-9]+\.css$/',$css_file_name) ){
			$list[] = $css_file_name;
			$css_file_name = false;
		}

	}