I read something about how to do it in this "post":http://merbist.com/2008/10/27/will_paginate-and-merb/ by The merbist, albeit the information was not complete. So here are my instructions: Clone mislav's will_paginate repo and build the gem from the agnostic branch. With this commands you've generated the will_paginate-3.0.0.gem. If you want to install it system-wide use your usual gem install. If you want to bundle it in your project, as I did, then you'll have to do: That's it.