Howdy,
I was playing with your X packages from the git repo and thought I'd let you know of some slight broken packages.
* Mesa has a bad link of libGL.so to libGL.so.1.6.0 (instead of libGL.so.1.2.0).
* Both xorg-fbdev & xorg-vesa require a simple patch to remove mibstore.h for xorg 1.14.x. (I used the patches from Gentoo unchanged, added them to the debian/patches folder, and added to the patch series.)
* libglu requires a fix in debian/rules to properly generate the package.install files (For my own uses, I simply added an asterisk after "DEB_HOST_MULTIARCH," but this is likely incorrect for packaging)
After these fixes, the xserver-xorg-{video,input} plugins used must be rebuild against an installed xserver-xorg 1.14. Also installed from git: libdrm, libxi, wayland, pixman, x11proto-input, etc.
With these few changes I'm able to run Mesa 9.1, xorg 1.14 and xorg-intel 2.21.6
Thanks for your development!
Michael