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Ted Zlatanov wrote:
>        via  6ace9d5942b93402b9468402592c545dbb92b007 (commit)
>        via  404c492543314455e4f96c80bb0372e1741f0906 (commit)
>       from  ca9880f98c58290a72dc5ad8efbe966bdea725a1 (commit)
[...]
> +;;;###autoload
> +(defun gnus-registry-install-nnregistry ()
> +  "Install the nnregistry refer method in `gnus-refer-article-method'."
> +  (interactive)
> +  (when (featurep 'nnregistry)
> +    (setq gnus-refer-article-method
> +          (delete-dups
[...]

Could you provide `gnus-delete-dups' or something for XEmacs 21.4?
XEmacs 21.5 and SXEmacs 22.1 (and Emacs >=22 of course) provide
`delete-dups' in subr.el, however XEmacs 21.4 doesn't.