lowered-expectations

https://github.com/ianchesal/loweredexpectations

A Ruby gem that lets you test for the presence of command line tools and ensure that you have a version of the tool that you know how to work with. It uses the gem system's version matching semantics so you can do things like enforce a major version but allow any minor version above a certain value for a tool. If you use Gemfile's the syntax should look pretty familiary to you.