RVM is highly recommended for Omega 4. For more information about this, please see the previous page and the 'Gem Management' section at https://rvm.io/.

Here's a 3 min screencast that covers an Ubuntu installing everything required via rvm, including ruby and bundler : http://www.youtube.com/watch?v=RDuSrP3w06Y

PLEASE NOTE: Omega 4.x does not require that you use Sass or any of its related frameworks, however the ease of creating layouts and the time saved while doing so by using Sass is invaluable. Therefore it is not only encouraged that you embrace Sass, but also these other development tools for managing your local environment and Ruby gems.

The development environment for processing SASS will depend on what starterkit you utilize: