I used CentOS 7 for that and your "install-requisites.sh" script from
https://github.com/philippeback/pharovm-centos65 was very helpful.

The "CentOS" section on http://pharo.org/gnu-linux-installation page 
should be updated with this info or at least with a link.

For those without CentOS a screenshot is attached. And yes I know: working
as "root" is evil - but this is a temporary vbox instance ;)

Have fun
T.