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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Retrieving the "include" directory for Emacs Modules
Date: Sat, 07 Dec 2024 18:43:19 +0200
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 (message from Marco Antoniotti on Sat, 7 Dec 2024 17:27:16 +0100)
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> From: Marco Antoniotti <marcoxa@gmail.com>
> Date: Sat, 7 Dec 2024 17:27:16 +0100
> 
> To compile Emacs C modules we need the proper 'include' directory.  I.e.,
> we need to stick that information into Makefiles.
> 
> We do have lisp-directory (and we can surmise the location of the include
> directory from it), but it would be nice to have something like
> em-include-directory (the em- prefix for "Emacs Module").

Isn't that

  (expand-file-name "../../../include" data-directory)

?