- Download & install Command line tools for Xcode 4.4 (you don’t need to download Xcode):https://developer.
- Install Homebrew: https://github.com/
- Install automake:
brew install automake
- Install RVM as usual and select 1.9.3-head as the default ruby installation: https://rvm.io/
Optional step: You may need XQuartz for some components, for example for Imagemagick, so download & install XQuartz: http://xquartz.