# File lib/systemu.rb, line 33
  def self.ruby
    return @ruby if @ruby

    c = begin; ::RbConfig::CONFIG; rescue NameError; ::Config::CONFIG; end
    ruby = File.join(c['bindir'], c['ruby_install_name']) << c['EXEEXT']
    @ruby = if system('%s -e 42' % ruby)
      ruby
    else
      system('%s -e 42' % 'ruby') ? 'ruby' : warn('no ruby in PATH/CONFIG')
    end
  end