getsentry/raven-ruby — pull request #133 by halostatue (2013-09-24 19:00:24+00:00)
Title: Compatibility with non-rvm switchers

Specifying a gemset in ruby-version is not compatible with switchers
(chruby, rbenv) that do not have the intrinsic concepts of gemsets.

See http://stackoverflow.com/a/15709012/36378