mavericks ruby rails

- Install XCode from the app store.

- Install XCode command-line tools.
 $ xcode-select --install

- Install home brew.  http://brew.sh/
 $ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

- Install database development packages.
 $ brew install postgresql
 $ brew install mysql

- Install RVM.  https://rvm.io/rvm/install
 $ curl -sSL https://get.rvm.io | bash
 $ rvm requirements

- Exit your open terminal and open a new one.

- Install ruby 2.0 via RVM (this makes gem management with user permissions simpler.)
 $ rvm install 2.0
    
- Install rails
 $ gem install rails --version=4.0.4