PHP 7 RC3: How to install missing MySQL PDO

Question

I am trying to setup webserver with PHP 7 RC3 + Nginx on Ubuntu 14.04 (for test purposes).

I installed Ubuntu in Vagrant using

Answer 1

Since eggyal didn't provided his comment as answer after he gave right advice in a comment - i am posting it here: In my case I had to install module php-mysql. See comments under the question for details.