+ opts.banner = %{Usage: build.rb <command> [options]
+
+Use 'build.rb' to build the manual. Use 'build.rb serve' to also
+start a web server; setting any web server options implies "serve".
+}
+ opts.on("-w", "--watch", "Watch for changes") { options[:watch] = true }
+ opts.on("-p", "--port N", Integer, "Specify port for web server") { |p| options[:port] = p }