cd /tmp/
sudo wget http://bart.eaccelerator.net/source/0.9.6.1/eaccelerator-0.9.6.1.tar.bz2
sudo tar xvjf eaccelerator-0.9.6.1.tar.bz2
cd eaccelerator-0.9.6.1
sudo phpize
sudo ./configure --enable-eaccelerator=shared
sudo make
sudo make install
cd ~

sudo vim /etc/php5/fpm/php.ini

; eAccelerator configuration
; Note that eAccelerator may also be installed as a PHP extension or as a zend_extension
; If you are using a thread safe build of PHP you must use
; zend_extension_ts instead of zend_extension
;extension = "/usr/lib/php5/20090626/eaccelerator.so"
zend_extension = "/usr/lib/php5/20090626/eaccelerator.so"
eaccelerator.shm_size = "16"
eaccelerator.cache_dir = "/var/cache/eaccelerator"
eaccelerator.enable = "1"
eaccelerator.optimizer = "1"
eaccelerator.check_mtime = "1"
eaccelerator.debug = "0"
eaccelerator.filter = ""
eaccelerator.shm_max = "0"
eaccelerator.shm_ttl = "0"
eaccelerator.shm_prune_period = "0"
eaccelerator.shm_only = "0"
eaccelerator.compress = "1"
eaccelerator.compress_level = "9"
eaccelerator.allowed_admin_path = "/var/www/eaccelerator"

sudo mkdir -p /var/cache/eaccelerator
sudo chmod 0777 /var/cache/eaccelerator

sudo /etc/init.d/php5-fpm restart