The required [`HOST_NAME_MAX`](https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/limits.h.html#:~:text=HOST_NAME_MAX) constant for use with the [`gethostname`](https://pubs.opengroup.org/onlinepubs/9799919799/functions/gethostname.html) function is missing for most platforms.
The required
HOST_NAME_MAXconstant for use with thegethostnamefunction is missing for most platforms.