(gnus-group-make-help-group): Check whether

`installation-directory' is nil before using it.

diff --git a/lisp/gnus.el b/lisp/gnus.el
index 7fab728a264cf67a4194a78869435a071849aad9..e7506466f3832d5268360b60af6d246e14ff2857 100644 (file)
--- a/lisp/gnus.el
+++ b/lisp/gnus.el
@@ -4259,7 +4259,9 @@ ADDRESS."
 (defun gnus-group-make-help-group ()
   "Create the Gnus documentation group."
   (interactive)
-  (let ((path (cons (concat installation-directory "etc/") load-path))
+  (let ((path (if installation-directory
+                 (cons (concat installation-directory "etc/") load-path)
+               (cons data-directory load-path)))
        (name (gnus-group-prefixed-name "gnus-help" '(nndoc "gnus-help")))
        file)
     (and (gnus-gethash name gnus-newsrc-hashtb)