[Xcb] check for xproto

[Jamey Sharp]

On Fri, Nov 24, 2006 at 05:53:30PM -0600, Jeremy C. Reed wrote:
> My xau.pc was too old (from xlibs). Sorry for the false report.
> 
> The xau.pc I used did not have "Requires: xproto". (If a newer one does 
> then maybe configure.ac should depend on that.)

Yeah, it probably should.

> Hmmm.. But I do see correct xau.pc.in in git. My libXau is very old 
> (from xlibs). I haven't had any PKG_CHECK_MODULES force newer version of 
> libXau, so I never noticed this before.
> 
> So ignore this request. I will update my libXau on this system. :)

Before you do that, I've pushed a check for xau >= 0.99.2, which appears
to be the first release with the correct 'Requires: xproto' line. The
last version from the two-year-old xlibs CVS repository apparently had a
package version of 0.1.2, so I think this should work. If you can check
that this fix correctly stops your configure, I'd appreciate it.

Thanks for reporting this: catching this kind of problem automatically
is definitely a good thing.

> I see my xdmcp.pc does have "Requires: xproto" but for my builds I use 
> symlinks for my pkgconfig, headers and libraries (which makes it great for 
> testing builds) and xdmcp.pc was not used. The configure didn't fail:
> 
> So xdmcp was not required.

Yeah. libXdmcp is optional for XCB, needed only if you want support for
XDM-AUTHORIZATION-1 in addition to MIT-MAGIC-COOKIE-1.

--Jamey
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