way to enable built-in cua-mode if user loads older CUA-mode package.
;;;###autoload (eval-after-load 'CUA-mode
;;;###autoload '(error (concat "\n\n"
-;;;###autoload "CUA-mode is now part of the standard GNU Emacs distribution,\n"
-;;;###autoload "so you may now enable and customize CUA via the Options menu.\n\n"
+;;;###autoload "CUA-mode is now part of the standard GNU Emacs distribution, so you may\n"
+;;;###autoload "now enable CUA via the Options menu or by customizing option `cua-mode'.\n\n"
;;;###autoload "You have loaded an older version of CUA-mode which does\n"
;;;###autoload "not work correctly with this version of GNU Emacs.\n\n"
;;;###autoload (if user-init-file (concat