[the_french]

IIRC ruby is in fact standard and was recently updated to be 2.0.0 on the latest version of OS X.

   /usr/bin/ruby -v
   ruby 2.0.0p247 (2013-06-27 revision 41674) [universal.x86_64-darwin13]

[nmc]

My bad! Completely forgot about that!

Considering that rvm and gems are a real pain in the azz, I think this could still benefit from a rewrite.

[kbar13]

Use rbenv:

https://github.com/sstephenson/rbenv

Best decision I've made.