Define `delete-dups' for XEmacs

diff --git a/lisp/gnus-compat.el b/lisp/gnus-compat.el
index ce3ad98..deaf2f9 100644 (file)
--- a/lisp/gnus-compat.el
+++ b/lisp/gnus-compat.el
@@ -129,6 +129,18 @@ TRASH is ignored."
       (forward-line arg))
     (beginning-of-line)))
 
+(unless (fboundp 'delete-dups)
+  (defun delete-dups (list)
+    "Destructively remove `equal' duplicates from LIST.
+Store the result in LIST and return it.  LIST must be a proper list.
+Of several `equal' occurrences of an element in LIST, the first
+one is kept."
+    (let ((tail list))
+      (while tail
+       (setcdr tail (delete (car tail) (cdr tail)))
+       (setq tail (cdr tail))))
+    list))
+
 (provide 'gnus-compat)
 
 ;; gnus-compat.el ends here