# File lib/chef/provider/package/rubygems.rb, line 263
          def gem_platforms
            if self.class.platform_cache.key?(@gem_binary_location)
              self.class.platform_cache[@gem_binary_location]
            else
              gem_environment = shell_out!("#{@gem_binary_location} env").stdout
              if jruby = gem_environment[JRUBY_PLATFORM]
                self.class.platform_cache[@gem_binary_location] = ['ruby', Gem::Platform.new(jruby)]
              else
                self.class.platform_cache[@gem_binary_location] = Gem.platforms
              end
            end
          end