Make `ielm' setup work on Emacs-29.0.60

README.org

@@ -4233,15 +4233,17 @@ many Emacs Lisp idioms.
 
 Listing [[lst:setup-ielm][setup ielm]] customizes the [[https://wikemacs.org/wiki/IELM][Interactive Emacs Lisp Mode]] for better
 interoperability with [[https://smartparens.readthedocs.io/en/latest/][Smartparens]]: get help on the key bindings by means of
-src_emacs-lisp{(describe-mode (get-buffer "*ielm*"))}.
+src_emacs-lisp{(describe-function 'inferior-emacs-lisp-mode)}.
 
-#+caption)}[Setup =ielm=]:
-#+caption: Install =ielm=.
+#+caption[Setup =ielm=]:
+#+caption: Setup =ielm=.
 #+name: lst:setup-ielm
 #+begin_src emacs-lisp
 (with-eval-after-load 'ielm
-  (custom-set-variables
-   '(ielm-dynamic-return nil)))
+  (if (version< "29.0.0" emacs-version)
+      (setopt ielm-dynamic-return nil)
+    (custom-set-variables
+     '(ielm-dynamic-return nil))))
 #+end_src
 
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