Install Xcode
Head to the Apple Developer Center to download a copy of the latest Xcode
Install Homebrew
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
Install Git
brew install git
You will also want to setup your Git and GitHub user details
git config --global user.name "Lance Ball"
git config --global user.email "lball@redhat.com"
git config --global credential.helper osxkeychain
Setup common git aliases.
git config --global alias.co checkout
git config --global alias.br branch
git config --global alias.ci commit
git config --global alias.st status
Install Java 8
https://jdk8.java.net/download.html
Install RVM
\curl -sSL https://get.rvm.io | bash -s stable
Install JRuby
rvm install jruby