# File src/ruby_supportlib/phusion_passenger/config/nginx_engine_compiler.rb, line 115
      def before_install
        super
        if !@working_dir
          @working_dir = PhusionPassenger::Utils.mktmpdir("passenger-install.", PlatformInfo.tmpexedir)
          @owns_working_dir = true
        end
        @nginx_version ||= PREFERRED_NGINX_VERSION
      end