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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Ubuntu 16.04 cannot compile commit
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Date: Fri, 24 Jan 2020 15:28:34 +0200
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To: Uwe Brauer <oub@mat.ucm.es>
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In-reply-to: <87wo9hb1ej.fsf@mat.ucm.es> (message from Uwe Brauer on Fri, 24
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> From: Uwe Brauer <oub@mat.ucm.es>
> Date: Fri, 24 Jan 2020 11:21:24 +0100
> Cc: Uwe Brauer <oub@mat.ucm.es>, emacs-devel@gnu.org
> 
>    > In that case I suggest debugging 'configure' to see why it outputs
>    > '-lpng12' even though you haved png16 installed.
> I am sure how to debugg configure.

By looking at config.log, and searching for "png".