code: func standardFlags(cmd string) (*flag.FlagSet, *string) {
  	f := flag.NewFlagSet(appName()+" "+cmd, flag.ExitOnError)
  	target := f.String("target", "", "Make target (example: $(FOO_BINARY))")
  	return f, target
  }
docs: // standardFlags returns a new flag set with target flag already set up