Compiling with the _DECC_V4_SOURCE and _VMS_V6_SOURCE feature-
    test macros defined enables a local-time-based entry point to the
    stat function that is equivalent to the behavior before OpenVMS
    Version 7.0.

    Compiling with the _USE_STD_STAT feature-test macro defined
    enables a variant of the stat function that uses an X/Open
    standard-compliant definition of the stat structure. The _USE_
    STD_STAT feature-test macro is mutually exclusive with the _DECC_
    V4_SOURCE and _VMS_V6_SOURCE macros.