@item
This function has quadratic instead of linear worst-case complexity on some
platforms:
-glibc 2.8, FreeBSD 6.2, NetBSD 5.0, OpenBSD 4.0, Solaris 11 2010-11.
+glibc 2.8, FreeBSD 6.2, NetBSD 5.0, OpenBSD 4.0, Solaris 11 2011-11.
@end itemize
Portability problems not fixed by Gnulib: