# File src/ruby_supportlib/phusion_passenger/platform_info/apache.rb, line 188
    def self.httpd_default_root(options = nil)
      if options
        info = apache2ctl_V(options)
      else
        info = apache2ctl_V
      end
      if info
        info =~ / -D HTTPD_ROOT="(.+)"$/
        return $1
      else
        return nil
      end
    end