@item
This function reports failure for @code{strerror_r(0, buf, len)},
although POSIX requires this to succeed, on some platforms:
-FreeBSD 8.2
+FreeBSD 8.2.
+@item
+This function produces a different string for @code{0} than
+@code{strerror} on some platforms:
+MacOS X 10.5.
@item
This function always fails when the third argument is less than 80 on some
platforms: