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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Emacs 27.1 Windows Binaries -- testing wanted
Date: Tue, 18 Aug 2020 19:33:21 +0300
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> From: Óscar Fuentes <ofv@wanadoo.es>
> Date: Tue, 18 Aug 2020 17:57:05 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > For images, verify that (image-type-available-p 'TYPE) returns non-nil
> > for all the supported TYPEs.  For other optional features, similar
> > functions generally exist that can be probed; let me know if you need
> > more detailed advice.
> 
> A function that checks and shows the availability of every possible
> optional feature would be handy.

Many of them already have such a function.  Some need alternative
testing methods.