Thanks,
I took a fresh clone of the source from githubs emacs-mirror, and it compiled OK.
It came be closed

mvh
Niels
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Niels Søndergaard

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Den 5. nov. 2021 kl. 21.21 skrev Eli Zaretskii <eliz@gnu.org>:

From: Glenn Morris <rgm@gnu.org>
Cc: Niels Søndergaard <nisoni@algon.dk>,
 51611@debbugs.gnu.org
Date: Fri, 05 Nov 2021 15:05:20 -0400

WEBP_CFLAGS is missing from src/Makefile.in.

Thanks, should be fixed now.

Niels, please try the latest master branch.