bug#17438: xrandr linking problem on OS X

[Glenn Morris]

Eli Zaretskii wrote:

> That only hits ancient versions of pkg-config, before 0.26.  Do you
> indeed have such an old version on Hydra?

It's not my version, but yes, it is 0.23.

Options to fix this are: to require pkg-config >= 0.26 in autogen.sh
(the requirement in configure would be unchanged); 
or to copy a recent pkg.m4 into the m4 directory in the Emacs repo.