# guest: DragonFly dfbsd 6.5-DEVELOPME3988T #0 Thu Jul  2 06:02:54 UTC 2026 x86_64
# build: cc -O2 -Wall -Wextra -o /tmp/tr3988 /tmp/t3988.c   (guest cc 8.3 [DragonFly])
# run:   /tmp/tr3988   (as root via vm.sh run_root)
$ cc -O2 -Wall -Wextra -o /tmp/tr3988 /tmp/t3988.c
(no warnings, no errors)