Re: Merging feature/android

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: emacs-devel@gnu.org,  eggert@cs.ucla.edu
> Date: Fri, 03 Mar 2023 16:03:38 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > If not, please explain more, because I don't think I understand what
> > you say above.
> 
> I was saying that the HarfBuzz check currently doesn't show an error
> when it is enabled with ``--with-harfbuzz'' and HarfBuzz is not found.

That's strange, because image libraries use the same OPTION_DEFAULT_ON
way, and I definitely remember seeing an error message when I used the
"--with-gif" option and the library wasn't available.  The message
suggested using ifavailable instead.

> The reason is precisely that the option doesn't default to ifavailable;
> as a result, configure cannot tell apart the two cases where
> $with_harfbuzz is specified on the command line, and when it is simply
> set to yes as its default value.  That's why ifavailable is required.

Do you see the same with image libraries?