building xf86 partially

Hi folks,


for my automated distro builder I'm looking for a way to compile 
xf86 only partially, part by part, ie. first the libraries then 
several Xservers and utils separately. My buildsystem shall
generate a bunch of very small packages (ie. an own package for
each application).
Of course I could always build the whole tree and just take a few 
files for every package, but this would take a really long time.
Generating a dozen of binary packages in one compile pass is not 
possible with my current model. 

How can I select which parts to build ?


thx
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