Hardware and performance

I have PHP 5.1.6 and eAccelerator installed on a 3 node php cluster running CentOS 5.2. I am running into this error:

$CFG->eaccelerator is set to true but the required functions are not available. You need to have either eaccelerator or turckmmcache extensions installed, compiled with the shmem keys option enabled.

* line 29 of lib/eaccelerator.class.php: call to debugging()
* line 358 of lib/setuplib.php: call to eaccelerator->eaccelerator()
* line 348 of lib/setup.php: call to init_eaccelerator()
* line 20 of config.php: call to require_once()
* line 33 of index.php: call to require_once()

Error initialising eaccelerator cache

* line 349 of lib/setup.php: call to debugging()
* line 20 of config.php: call to require_once()
* line 33 of index.php: call to require_once()

I've read the forum and found that I am missing a compile option or two in my PHP install; the problem is, I have apache/php and eAccelerator installed via Yum. Has anyone managed to get eAccelerator to work with Moodle without installing apache/php from source?