I need to deploy a Rails app packaged up as a RHEL RPM. I want to bundle *some* of the gems it requires, but let the rest be satisfied from the production machine's system gems.

As an end result (for instance), I want the app to find some gems (like `versionomy`, for instance) in the app's `vendor` tree, but find the Rails `activerecord`, `actionpack`, and other gems in the host's system-wide gem library.

So far I've only found ways to bundle all-or-nothing. Can anyone point me to documentation explaining how to use Bundler and yet have `$:` be a search path, listing the app's bundled gems first and then the system's gems? Or if it's even possible?

Thanks!