installing ruby on rails on passenger dosn't work

Question

is there a good and simple installation guide how to install phusion passenger on my apache2 and then install ruby on rails?

I'm using debian 7

i've done point 2.31 and 2.3.2 https://www.phusionpassenger.com/documentation/Users%20guide%20Apache.html#rubygems_generic_install

then I tried this: $ gem install rails

and got this error

Answer 1

You don't have the -dev package installed, so it can't find mkmf.

Run sudo apt-get install ruby1.9.1-dev to install the dev package for 1.9.1