setup_pager

# File lib/rdoc/ri/ri_display.rb, line 211
  def setup_pager
    unless @options.use_stdout
      for pager in [ ENV['PAGER'], "less", "more", 'pager' ].compact.uniq
        return IO.popen(pager, "w") rescue nil
      end
      @options.use_stdout = true
      nil
    end
  end