Sets in maxima



I can't get the set functions to load in maxima 5.9.1, with 
load("set");
(see below)

This is independent of Windows or Linux.

I have looked at Barton Willis's contributed nset package instead, but of
course I'd prefer to use packages that are included in the core of Maxima
itself.

Thanks
Chris



Maxima 5.9.1 http://maxima.sourceforge.net
Using Lisp CMU Common Lisp 19a
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function bug_report()
provides bug reporting information.
(%i1) load("set");

Load failed for /usr/share/maxima/5.9.1/share/misc/set.lisp
 -- an error.  Quitting.  To debug this try DEBUGMODE(TRUE);