add require_once to class file locator

library/Zend/File/ClassFileLocator.php

@@ -18,6 +18,8 @@
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
+require_once 'Zend/File/PhpClassFile.php';
+
 /**
  * Locate files containing PHP classes, interfaces, or abstracts
  *