bug#51611: 29.0.50; Compiling emacs 29.0.50 on macOS

[Eli Zaretskii]

> From: Niels Søndergaard <nisoni@algon.dk>
> Date: Fri, 5 Nov 2021 18:22:32 +0100
> Cc: Niels Søndergaard <nisoni@algon.dk>,
>  51611@debbugs.gnu.org
> 
> pkg_cv_WEBP_CFLAGS=-I/opt/homebrew/Cellar/webp/1.2.1_1/include
> pkg_cv_WEBP_LIBS='-L/opt/homebrew/Cellar/webp/1.2.1_1/lib -lwebp'
> 
> I also have a “decode.h” at 
> /opt/homebrew/Cellar/webp/1.2.1_1/include/webp/decode.h, in "image.c"
> here is an include "webp/decode.h”, so in my theory it should work, but it 
> does not.

If you say "make V=1", do you actually see the
"-I/opt/homebrew/Cellar/webp/1.2.1_1/include" command-line option used
by the compiler when compiling Emacs?