[Xcb] Splitting up xcb-util repository

[Arnaud Fontaine]

Hello,

    > I have been dreaming of using AC_PATH_PROGS_FEATURE_CHECK as well,
    > but  for xorg the lowest  common denominator for  autoconf is 2.60
    > and automake 1.9.

Fair enough, I  didn't know about that requirement,  certainly because I
wasn't aware of the "ModularDevelopersGuide" page on the Wiki ;).

    > I  am very curious as  to what did  not work well. I'll  update my
    > little test plan to  make sure everything is covered.  Obviously I
    > don't have all the platforms, so I have to fake some conditions.

I also  fake the  conditions with gm4  and /usr/gnu/bin, but  well, it's
relatively easy to test anyway.

    > I tried the patch, it looks perfect. I like the commit message and
    > comment. This is the logic I attempted to code in my patch.

    > Given  your research above,  suppose we were to  use AC_PATH_RPOGS
    > with gm4 first and then m4. I think it would cover all (real life)
    > scenarios correctly.  If that does not work, you can always fix my
    > patch.

I think so too.  I will test a bit more your macro  this WE and will let
you know. Thanks much!

Cheers,
--
Arnaud Fontaine (arnau)