/* mkdtemp(3) function support: added as adjunct to feature request #2003.
* POSIX wants _XOPEN_SOURCE >= 700, (implying _POSIX_C_SOURCE >= 200809L).
/* mkdtemp(3) function support: added as adjunct to feature request #2003.
* POSIX wants _XOPEN_SOURCE >= 700, (implying _POSIX_C_SOURCE >= 200809L).