Hi,

I have been replacing to calls to =custom-set-variables= with calls to 
the safer
=setopt= (new in Emacs-29.0.60) and I discovered that calling
src_emacs-lisp{(setopt org-babel-load-languages '((eshell t) (emacs-lisp 
t)))}
raises a warning because =eshell= is missing from the 
=org-babel-load-languages=
=defcustom=.  The code below shows that this =defcustom= is quit out of 
sync with
the rest of the code base:

#+header: :wrap "src emacs-lisp :results silent :tangle no"
#+begin_src emacs-lisp :exports both :results value pp :exports both
(defun all-org-babel-execute-fns ()
   "Find `ob-LANGUAGE' files in Org defining 
`org-babel-execute:LANGUAGE'.

Return a list of items where the filename is the `car' of each item and 
the
`cdr' of each item lists the `org-babel-execute:LANGUAGE' functions."
   (let* ((dir (file-name-parent-directory (locate-library "org")))
          (names (directory-files dir t (rx "ob-" (+ print)  ".el" 
eos))))
     (cl-loop for name in names
              for found = (has-org-babel-execute-fn name)
              when found collect found)))

(defun has-org-babel-execute-fn (name)
   (let* ((buffer (find-file-noselect name))
          (base (file-name-base (buffer-file-name buffer)))
          (regexp (rx "defun" (+ blank) "org-babel-execute:" (group (+ 
graphic))))
          (matches))
     (save-match-data
       (save-excursion
         (with-current-buffer buffer
           (save-restriction
             (widen)
             (goto-char 1)
             (while (re-search-forward regexp nil t 1)
               (push (match-string-no-properties 1) matches))))))
     (when matches
       `(,base ,@matches))))

(all-org-babel-execute-fns)
#+end_src

#+RESULTS:
#+begin_src emacs-lisp :results silent :tangle no
(("ob-C" "C" "D" "C++" "cpp")
  ("ob-R" "R")
  ("ob-awk" "awk")
  ("ob-calc" "calc")
  ("ob-clojure" "clojurescript" "clojure")
  ("ob-css" "css")
  ("ob-ditaa" "ditaa")
  ("ob-dot" "dot")
  ("ob-emacs-lisp" "emacs-lisp")
  ("ob-eshell" "eshell")
  ("ob-forth" "forth")
  ("ob-fortran" "fortran")
  ("ob-gnuplot" "gnuplot")
  ("ob-groovy" "groovy")
  ("ob-haskell" "haskell")
  ("ob-java" "java")
  ("ob-js" "js")
  ("ob-julia" "julia")
  ("ob-latex" "latex")
  ("ob-lilypond" "lilypond")
  ("ob-lisp" "lisp")
  ("ob-lua" "lua")
  ("ob-makefile" "makefile")
  ("ob-maxima" "maxima")
  ("ob-ocaml" "ocaml")
  ("ob-octave" "octave" "matlab")
  ("ob-org" "org")
  ("ob-perl" "perl")
  ("ob-plantuml" "plantuml")
  ("ob-processing" "processing")
  ("ob-python" "python")
  ("ob-ruby" "ruby")
  ("ob-sass" "sass")
  ("ob-scheme" "scheme")
  ("ob-screen" "screen")
  ("ob-sed" "sed")
  ("ob-shell" "shell")
  ("ob-sql" "sql")
  ("ob-sqlite" "sqlite"))
#+end_src

The attached patch synchronizes the =defcustom= with the rest of the
code base, groups languages by org-babel file, and uses camel-case to
spell languages (the new fashion).

Best regards -- Gerard