write_require_paths_file_if_needed (Gem::RequirePathsBuilder)

    # File lib/rubygems/require_paths_builder.rb, line 4
      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