$ cc -O2 -pthread -Wall -o race_sim race_sim.c
$ uname -a
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
/usr/libexec/binutils234/elf/ld.gold: error: /dev/null: file is empty
/boot/kernel/if_urtwn.ko
0
urtwn module NOT loaded (no hardware)