[PATCH] configure.ac: add option for xshmfence

[Burton, Ross]

On 7 July 2014 17:47, Matt Turner <mattst88 at gmail.com> wrote:
> s/aspired to/desired/ seems a lot less awkward.

You know I was having writer's block for a good minute trying to
express myself there.  Yes, desired is the word I was after.

> It looks like you're going to a lot of effort to avoid the
> PKG_CHECK_MODULES if xshmfence is disabled. Any particular reason?
>
> Does the pattern used for libunwind work instead?

Probably because I didn't realise until right at the end that
XSHMFENCE_CFLAGS and XSHMFENCE_LIBS are never used...  It's not a lot
of logic mind, but I can change it.

Ross