Steps to set up a Rails development environment on OS X:
- install Apple Command Line Tools
- install homebrew[1]:
ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)"
- install rvm:
curl -L https://get.rvm.io | bash -s stable
source $HOME/.rvm/scripts/rvm
rvm install --disable-binary 1.9.3
rvm use --default 1.9.3