[Mediawiki-l] eAccelerator installed, not recognized by MW

[contact at 64north.net]

PHP 5.1.6, Centos 5.3 x64
MW installed via ATrpms, mediawiki-1.15.1
eAccelerator installed via 'yum install php-eaccelerator' which installed
eaccelerator-5.1.6_0.9.5.2

phpinfo() shows:
Quote:
eAccelerator
eAccelerator support enabled
Version 0.9.5.2
Caching Enabled true
Optimizer Enabled true
Memory Size 33,554,376 Bytes
Memory Available 28,066,960 Bytes
Memory Allocated 5,487,416 Bytes
Cached Scripts 33
Removed Scripts 0
Cached Keys 0
MW shows: "Couldn't find Turck MMCache, eAccelerator, APC or XCache;
cannot use these for object caching."

Yes, I did restart httpd, no joy.

There are number of occurrences of this issue in the IRC channel logs, but
unfortunately the answers are difficult to find (if there are any). 
Google wasn't all that helpful just yet, so I figure to give this a shot.
If anyone has any ideas at all, I would much appreciate some feedback.
Thanks in advance.

Cheers,
Peter