libepoxy configure problem

[Bill Spitzak]

I have been able to reliably reproduce the problem:

Build and install mesa into a local $WLD directory. Also 
remove/rename/usr/include/EGL/eglplatform.h. This will simulate a system 
where the global install does not include mesa, but you have built a 
local copy.

Remove (or rename) these two files:

$WLD/lib/pkgconfig/xcb.pc
$WLD/lib/pkgconfig/xproto.pc

Then in libepoxy source do this:

git clean -xfd
./autogen.sh --prefix=$WLD
make

Make will fail as it will not find $WLD/include/EGL/eglplatform.h, due 
to $WLD/include not being on the include search path.

The file egl.pc *is* there, and if it was used would specify the 
necessary include directory. I think the libepoxy configure should use 
"pkg-config --cflags egl" somewhere?