bug#58830: 29.0.50; Build failure on master with cairo_ft_font_options_substitute

[Po Lu]

Sam James <sam@gentoo.org> writes:

> Emacs fails to compile from master (at commit
> e893fd10735239aeecae83805fc4cc6b37156a01)
> with an implicit function declaration
> (cairo_ft_font_options_substitute):
> ```
> xsettings.c: In function ‘apply_xft_settings’:
> xsettings.c:825:3: error: implicit declaration of function
> <E2><80>-Werror=implicit-function-declaration][]]
>   825 |   cairo_ft_font_options_substitute (options, pat);
>         |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>               |   cairo_font_options_status
> ```
>

That's pretty odd.  AFAIU we only support builds with cairo with the
FreeType frontend present.

Could you please send the contents of config.log?