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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Compressed *.el files
Date: Wed, 22 Sep 2021 16:08:55 +0300
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To: Andrea Corallo <akrl@sdf.org>
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Andrea,

The function comp-el-to-eln-rel-filename is capable of processing
compressed *.el.gz files, which is of course needed for working
correctly in an installed Emacs.  However, when it sees a file whose
name ends in .gz, it invokes the function md5_gz_stream, which is only
defined if Emacs was built with zlib.  Does this have some fallback
(which I'm missing ATM) for when Emacs was built without zlib, or do
we need to add something there?

Thanks.