building modular xorg

[Manoa Nosea]

according to:
http://dri.freedesktop.org/wiki/Building
http://wiki.x.org/wiki/ModularDevelopersGuide
http://xorg.freedesktop.org/wiki/Development/git

I more or less managed to built it, however if there is an updated
location for any of these manuals I would like to know if there are
any others.

the real problem however, is that none of them specify how to prevent
each package from accessing the system's libraries, so that the newly
built xorg only sees the dependencies that I build, not the ones that
are present in the system.