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If a previous copy of a gem is already installed, RubyGems will not reinstall the gem but only recompile its extensions. This seems like a good idea, but only if the gem is being installed from the registry. If we are installing a locally built package, then the package should be completely reinstalled and extensions compiled from the sources in the locally built package, not from the sources in the previous installation. https://github.com/rubygems/rubygems/commit/1c282d98d5