mktemp man pages says the following about mkdtemp(3)
1) STANDARDS:
The mkstemp() and mkdtemp() functions conform to IEEE Std 1003.1-2004
(``POSIX.1'') and IEEE Std 1003.1-2008 (``POSIX.1''), respectively.
2) BUGS:
The mkdtemp() function is nonstandard and should not be used if
portability is required.
As I can see mkdtemp(3) is described in POSIX
https://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdtemp.html
What is the value of BUGS note?
