wpCJ needs the Zend Engine with the Zend Optimizer freeware library, version 2.0.0+, installed in your server in order to run.
Please, refer to the following page for more information about it:
http://www.zend.com/en/support/knowledgebase.php?kbid=179&view_only=1
The Zend Optimizer can be downloaded from: http://www.zend.com/store/products/zend-optimizer.php
The following hosting providers have Zend Optimizer pre-installed:
The following hosting providers need manual installation of the library:
zend_optimizer.optimization_level=15
zend_extension=/USER/homepages/xx/xxxxxxxxxx/htdocs/ZendOptimizer.so
The following hosting providers does not provide the library nor allow you to install it, so wpCJ does not work on them: