[emms-help] define-obsolete-variable-alias error on emacs21

[Yoni Rabkin]

Much is the yo, I apologize for any mangling Gmail will do to this message

While trying to solve
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=314299 I installed
emacs21 on Debian with CVS emms.

I got the following error:

Symbol's function definition is void: define-obsolete-variable-alias

Which is called from line 174 of emms.el:

(define-obsolete-variable-alias (quote emms-sort-on-file-add) (quote
emms-playlist-sort-added-tracks-p))

-- 
"Cut your own wood and it will warm you twice"
        Regards, Yoni Rabkin Katzenell