CPanel includes support in their installer for eaccelerator; still, for some strange reason they don’t include support for APC also. So, if you want to install APC on your CPanel powered server, you will have to go back at the command line and install it manually.

Here are the steps needed to install the latest version of APC (3.1.8 at the time of writing this article; please check for the latest version available when you are reading this and make the changes accordingly):

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cd /usr/local/src
wget http://pecl.php.net/get/APC-3.1.8.tgz
tar -zxvf APC-3.1.8.tgz
cd APC-3.1.8
phpize
./configure --enable-apc --enable-apc-mmap --with-apxs --with-php-config=/usr/local/bin/php-config
make
make install

Next, activate the apc module in php.ini by adding something like this:

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extension="apc.so"
apc.enabled=1
apc.shm_segments=1
apc.shm_size=128

Finally, you will have to restart apache and after that the APC module should be activated and in use. Hopefully, this will help you enable APC on your CPanel server in some very simple steps in less that 5minutes.