# File lib/bundler.rb, line 204
    def with_clean_env
      with_original_env do
        ENV["MANPATH"] = ENV["BUNDLE_ORIG_MANPATH"]
        ENV.delete_if {|k, _| k[0, 7] == "BUNDLE_" }

        if ENV.key?("RUBYOPT")
          ENV["RUBYOPT"] = ENV["RUBYOPT"].sub "-rbundler/setup", ""
        end

        if ENV.key?("RUBYLIB")
          rubylib = ENV["RUBYLIB"].split(File::PATH_SEPARATOR)
          rubylib.delete(File.expand_path("..", __FILE__))
          ENV["RUBYLIB"] = rubylib.join(File::PATH_SEPARATOR)
        end

        yield
      end
    end