    # File lib/compass/configuration/helpers.rb, line 18
          def add_configuration(config, filename = nil)
            return if config.nil?

            data = configuration_for(config, filename)

            # puts "New configuration: #{data.name}"
            # puts caller.join("\n")
            data.inherit_from!(configuration)
            data.on_top!
            @configuration = data
          end