Ruby 1.8.1:
    def create_logfile(filename)
      logdev = open(filename, (File::WRONLY | File::APPEND | File::CREAT))
      add_log_header(logdev)
      logdev
    end

Ruby 1.8.5:
    def create_logfile(filename)
      logdev = open(filename, (File::WRONLY | File::APPEND | File::CREAT))
      logdev.sync = true
      add_log_header(logdev)
      logdev
    end