Hey there!
I figure it’s been a little bit, so I’ve gone ahead and decided to update the XCache installer for version 1.3.0, and my favorite control panel, cPanel. 
This is incredibly easy to do and should get a basic/barebones XCache installation up and going fairly quickly on your CentOS + cPanel machine.
First, let’s grab our XCache sources…
cd /usr/src/
wget http://xcache.lighttpd.net/pub/Releases/1.3.0/xcache-1.3.0.tar.gz
Now, go ahead and unarchive the source, and change into the XCache build dir…
tar -xzvf xcache-1.3.0.tar.gz
cd xcache-1.3.0
Let’s prep our sources for the current PHP ecosystem…
root@SERVER [/usr/src/xcache-1.3.0]# phpize
Configuring for:
PHP Api Version: 20041225
Zend Module Api No: 20060613
Zend Extension Api No: 220060519
Now that should have gotten everything sorted with our sources so the XCache install is ready for our PHP version and environment, Let’s go ahead and kick off the build! Keep in mind, this build should be fairly fast and lightweight.
./configure && make && make install
The above line basically says “Run configure, if that is successful w/o errors, run a make, and if that finishes w/o error, run the install”. Once this is complete, you should see a line that says something like the following…
Installing shared extensions: /usr/local/lib/php/extensions/no-debug-non-zts-20060613/
This is going to be where our xcache.so file is located, however when cPanel builds your php.ini file, it’s going to have that set already. So getting the base module loaded is as simple as running the following command.
echo "extension=xcache.so" >> /usr/local/lib/php.ini
After that, you should be able to do a quick check of the PHP CLI and verify that it loaded properly with the ‘php -v’ command…
root@SERVER [/usr/src/xcache-1.3.0]# php -v
PHP 5.2.13 (cli) (built: Jun 16 2010 09:27:33)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2010 Zend Technologies
with XCache v1.3.0, Copyright (c) 2005-2009, by mOo
And there you go, you can safely restart Apache now and you should be serving cached content. Please keep in mind, you’ll need to configure your XCache setup to ensure everything is working properly, all we’ve done here is install the base module.
I’d suggest taking a look at our other article regarding the tuning of XCache for a bit more information on this.
That does it for now!