bug#51611: 29.0.50; Compiling emacs 29.0.50 on macOS

[Eli Zaretskii]

> Date: Fri, 5 Nov 2021 08:12:18 +0100
> From:  Niels Søndergaard via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> I did install the “web” with homebrew, and the missing file is on my system,
> But apparently not the expected place
> 
> When building emacs version 29.0.50, the build stops with:
> 
> "
>  CC      systhread.o
>  CC      fontset.o
>  CC      fringe.o
>  CC      image.o
> image.c:8770:10: fatal error: 'webp/decode.h' file not found
> #include "webp/decode.h"
>         ^~~~~~~~~~~~~~~

Where do you have decode.h on your system?