.BR strerror_r ()
is provided if:
.br
-(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !\ _GNU_SOURCE
+(_POSIX_C_SOURCE\ >=\ 200112L || _XOPEN_SOURCE\ >=\ 600) && !\ _GNU_SOURCE
.br
Otherwise, the GNU-specific version is provided.
.SH DESCRIPTION