# File lib/bundler/source.rb, line 159
      def install(spec)
        destination = Gem.dir

        Bundler.ui.debug "  * Installing from cache"
        installer = Gem::Installer.new "#{@path}/#{spec.full_name}.gem",
          :install_dir         => Gem.dir,
          :ignore_dependencies => true,
          :wrappers            => true,
          :env_shebang         => true,
          :bin_dir             => "#{Gem.dir}/bin"

        installer.install
        spec.loaded_from = "#{Gem.dir}/specifications/#{spec.full_name}.gemspec"
      end