Setup rbenv on Mac OS X

rbenv is a quick way to get different ruby versions installed on your OS, without interfering with any default installs it may provide.

Run the following commands:

brew update
brew install rbenv
brew install ruby-build

In your bash profile file, ensure that the following is included:

eval "$(rbenv init -)"

Now, install the latest version of ruby:

rbenv install 1.9.3-p0

Run the following to set rbenv to use this new version of ruby.

rbenv global 1.9.3-p0

Open a new shell and type ruby --version and if you see ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.2.0] then all is good and you’re all setup!

One thing to note is that if you install a new gem that installs a binary, you’ll need to run rbenv rehash afterwards in order for the binary to become available to you on the command line.