    # File lib/rubygems/require_paths_builder.rb, line 3
        def write_require_paths_file_if_needed(spec = @spec, gem_home = @gem_home)
          return if spec.require_paths == ["lib"] && (spec.bindir.nil? || spec.bindir == "bin")
          file_name = File.join(gem_home, 'gems', "#{@spec.full_name}", ".require_paths")
          file_name.untaint
          File.open(file_name, "w") do |file|
            spec.require_paths.each do |path|
              file.puts path
            end
            file.puts spec.bindir if spec.bindir
          end
        end