zend optimizer

$ eix zend
* dev-php4/ZendOptimizer [1]
     Available versions:  ~3.0.1
     Homepage:            http://www.zend.com/products/zend_optimizer
     Description:         The Zend PHP optimizer and loader for encoded scripts.

* dev-php5/ZendFramework
     Available versions:  ~0.2.0
     Homepage:            http://framework.zend.com/
     Description:         Zend Framework is a high quality and open source framework for developing Web Applications and Web Services with PHP 5.

* dev-php5/ZendOptimizer [1]
     Available versions:  ~3.0.1
     Homepage:            http://www.zend.com/products/zend_optimizer
     Description:         The Zend PHP optimizer and loader for encoded scripts.

[1] (layman/php-testing)

Правда я давно не обновлялся.
Ну ты понял да, что он есть в оверлее layman/php-testing