Few weeks ago I was trying to make Integrity work with Ruby 1.9.2 and Bundler. It's a well known CI tool, but kind of abandoned. I thought making it work with Ruby 1.9.2 could be tough, however the real problem was in Bundler. Integrity use Bundler to manage its dependencies. When Integrity runs a build it opens new subshell where your project is building. Here is how Integrity does it 1 2 3 4 5 6