viper and gnus in 21.0-b67

I have just installed xemacs 21.0-b67, and a sumo tarball dated 1999-03-12 on Solaris 1.5.1 (sparc) and RH GNU/Linux 5.2 (i686). Compilation, installation, and start-up all went great. On both platforms, after loading viper, I am told: Symbol's function definition is void: vc-backend whenever I try to save a file via: ESC : [w|x] RET I am able to save a file via: C-x C-s Also, when I `M-x gnus' on the GNU/Linux box (the Solaris box does not have access to the mail spool), gnus 5.6.45 (included in the sumo tarball mentioned above) and pgnus 0.83 (latest gnus beta from www.gnus.org), I am told: movemail: Permission denied for /var/spool/mail/Ea12407--see source file lib-src/ Ea12407 is not the name of the mail spool. I am unable to load gnus at this point. I have not defined my own movemail program. gnus and pgnus work fine in xemacs 20.4. I don't know lisp, otherwise I would have hoped to included a patch as well. Thanks, Tom -- Tom Vaughan <tvaughan at aventail dot com>