Paul Keusemann <pkeusem(a)visi.com> writes in xemacs-beta(a)xemacs.org:
I don't know if this particularly import but, I found this while
building 21.0.63...
Testing for Lisp shadows ...
This site has duplicate Lisp libraries with the same name.
If a locally-installed Lisp library overrides a library in the Emacs release,
that can cause trouble, and you should probably remove the locally-installed
version unless you know what you are doing.
/usr2/paulk/coronafs9/lib/xemacs/xemacs-packages/lisp/gnus/pop3
hides
/usr2/paulk/coronafs9/lib/xemacs/xemacs-packages/lisp/mail-lib/pop3
1 Emacs Lisp load-path shadowing was found
I believe you can remove the one in Gnus.