[Bug 259975] sys/file.h fails when -D_POSIX_C_SOURCE=200809L is given

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259975

--- Comment #6 from Warner Losh <imp@FreeBSD.org> ---
The other workaround for this would be to add -D__BSD_VISIBLE=1 to the
compliation.

The hdf sources already do something similar for _GNU_SOURCE to bring in extra
functionality that's only in Linux, but we have no similar _BSD_SOURCE or
_FREEBSD_SOURCE (NetBSD and OpenBSD both have _NETBSD_SORUCE or _OPENBSD_SOURCE
respectively). My inclination is to define _FREEBSD_SOURCE and have hdf use it
(and maybe __BSD_VISIBLE=1 as a transitionary workaround), but I'm open for the
least painful way to be both compliant with POSIX_C_SOURCE and the desire for
enabling extensions.

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