RiotGames/rbenv-cookbook — pull request #6 by cap10morgan (2012-04-26 17:03:26+00:00)
Title: install libreadline-dev in Ubuntu & Debian so irb will work

IRB needs libreadline-dev installed when a Ruby is compiled for it to work. So I added it to the packages that get installed on Ubuntu and Debian.

I don't know if RedHat-style distros need this or not, I've only tested on Ubuntu 11.10.