    # File lib/compass/compiler.rb, line 71
        def new_config?
          config_file = Compass.detect_configuration_file
          return false unless config_file
          config_mtime = File.mtime(config_file)
          css_files.each do |css_filename|
            return config_file if File.exists?(css_filename) && config_mtime > File.mtime(css_filename)
          end
          nil
        end