xdg-output was used to extract the output name, which can be obtained
from wl_output as of interface version 4, release in Wayland 1.20 almost
two years ago.
Useful for laptops with external displays connected. External displays
usually have an ability to adjust color temperature via built-in menu,
so you can run `wlsunset` exclusively for laptop's internal display.
Also different screens happen to look differently after setting the same
color temperature. Possibly has to do with the technology which
display is based on (TN or IPS).
Clang cannot decide how it wishes to handle implicit-fallthrough, with
different solutions across different versions, which presents a problem
on FreeBSD where several majors of clang remain relevant.
Disable implicit-fallthrough until clang has figured out what it wants
to do in life.