...
- Apache 2.2
- mod_SSL
- MySQL 5.1 (or above) - NOTE: Mysql 5.7+ is not currently compatible.
- PHP 5.3.2 - NOTE: PHP 7+ is not currently compatible.
- GD Library
- cURL
- php5_ctype (may not be installed by default on some Linux distros)
- php-mbstring extension required
- php-xml extension required
- php-xmlrpc extension required
- php-mysqli extension required usually labeled as php-mysql on package managers
...