So now, to get the sources you can do:
git clone git://anongit.freedesktop.org/git/xorg/xserver xserver.git
To compile:
cd xserver.git
./autogen.sh --prefix=/your/prefix --enable-debug --enable-xephyr --enable-kdrive --disable-xorg --disable-dmx --disable-xorgcfg --disable-xcalibrate --disable-xsdl --enable-dri --enable-glx --with-mesa-source=/your/mesa/chekout --disable-xprint --en
able-builtin-fonts --disable-tslib
Oh, you have to have a recent mesa as well. To you can get it with:
git clone git://anongit.freedesktop.org/git/mesa/mesa mesa.git
I personally use jhbuild to compile xorg stuff. If you have not tried it yet, you should give it a try because it eases dependencies management a lot. You can follow the instructions given here.
Mandatory screenshot:
Enjoy !