On Tue, Jan 11, 2022 at 01:23:34AM +0100, fatiparty@tutanota.com wrote:

[...]

> With file-name-concat, I get 
> 
> Symbol's function definition is void: file-name-concat
> 
> I am using GNU Emacs 27.2 of 2021-09-28

Oh, that seems to be an 28.1 introduction. Try

  (concat (file-name-as-directory my-gadi-basedir) dir)

instead. That seemed to be the recommended way, at least up to 27.2 [1].

Cheers

[1] https://www.gnu.org/software/emacs/manual/html_node/elisp/Directory-Names.html

-- 
t