5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchdir.html}
9 Portability problems fixed by Gnulib:
12 This function is missing on some platforms:
14 But the replacement function is not safe to be used in libraries and is not multithread-safe.
17 Portability problems not fixed by Gnulib: