5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/link.html}
9 Portability problems fixed by Gnulib:
12 This function is missing on some platforms:
15 This function fails to reject trailing slashes on non-directories on
17 Solaris, Cygwin 1.5.x.
20 Portability problems not fixed by Gnulib: