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Interpreter global gemsets
RVM provides (>= 0.1.8) a @global gemset per ruby interpreter.
Gems you install to the @global gemset for a given ruby are available to all other gemsets you create in association with that ruby.
This is a good way to allow all of your projects to share the same installed gem for a specific ruby interpreter installation.
To install a gem in the global gemset
rvm @global do gem install ...