Re: libpng issues

[Paul Eggert]

Werner LEMBERG wrote:
> I've just been bitten by
>
>    https://github.com/glennrp/libpng/issues/206
>
> For this reason I suggest two improvements for the configure script of
> emacs.
>
> (1) Use `pkg-config' before `libpng-config' to detect libpng.
>
> (2) If `libpng-config' is used, filter out `-L/usr/lib' and
>      `-L/usr/lib64' (as suggested in issue #206).

Thanks, I installed the attached into master. It does (1), and as I understand 
it when (1) works then (2) is unnecessary. I'm hoping we don't have to do (2) as 
I worry that it might break things on some platforms.

0001-Work-even-if-libpng-is-installed-in-usr-local.patch
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