Portability problems fixed by Gnulib:
@itemize
@item
-Some systems mistakenly succeed on @code{unlink("file/")}:
-Solaris 9.
+Some systems mistakenly succeed on @code{unlink("link-to-file/")}:
+GNU/Hurd, FreeBSD 7.2, Solaris 9.
+@item
+On MacOS X 10.5.6, in a writable HFS mount, @code{unlink("..")} succeeds
+without doing anything.
@end itemize
Portability problems not fixed by Gnulib: