$ sh build.sh
-rw-r--r--  1 root  wheel  104448 Jul  2 06:02 fire_saver.ko   (size per guest ls -l)
BUILD_OK

(no compilation: fire_saver.ko ships in /boot/kernel on the guest; the load
 itself runs fire_initialise -> get_mode_info(M_VGA_CG320), the capability gate)