bug#42188: Emacs master build fails on MACOS Catilina

[Alan Third]

On Sat, Jul 04, 2020 at 02:31:18PM +0000, Vincent Belaïche wrote:
> The build was made in a shell console of an older Emacs version, but
> that probably does not have any relationship with the issue.

Hi, this is a bug in homebrew's handling of system libraries. They
recently fixed it, so I think all you have to do is update homebrew:

    brew update

But if that fails you can install libxml2 manually then set:

    export PKG_CONFIG_PATH="`brew --prefix libxml2`/lib/pkgconfig:`brew 
--prefix libffi`/lib/pkgconfig"

-- 
Alan Third