# File lib/compass/commands/update_project.rb, line 48
      def new_compiler_instance(additional_options = {})
        compiler_opts = Compass.sass_engine_options
        compiler_opts.merge!(:quiet => options[:quiet],
                             :force => options[:force],
                             :sass_files => explicit_sass_files,
                             :dry_run => options[:dry_run])
        compiler_opts.merge!(additional_options)
        Compass::Compiler.new(working_path,
          projectize(Compass.configuration.sass_dir),
          projectize(Compass.configuration.css_dir),
          compiler_opts)
      end