Description: ------------ The script is doing: if (!defined('XML_BEAUTIFIER_INCLUDE_PATH')) { define('XML_BEAUTIFIER_INCLUDE_PATH', 'XML/Beautifier'); } ... but this does not appear to be behaving as expected under PHP 5.3.8. There's little point to having this - where it's used like: require_once XML_BEAUTIFIER_INCLUDE_PATH . '/Tokenizer.php'; is presumably for tests or building from SVN. Creating the right dir structure in SVN and running the tests from an appropriate location should correct this: svn mkdir XML svn mv Beautifier.php XML/ svn mv Beautifier/ XML/ vim package.xml