OK, proj build. mapnik would build, but the build is so extremely slow, that it's inacceptable.

scons from the sdk repo seems to be using the scratchbox python, but scratchbox python seems to be missing the subprocess modules. Is my scratchbox broken, am I missing something, or do you have an idea what to do with it?

As the build with sbox disabled is too slow to be acceptable, I can't build mapnik 'til this is fixed.

/edit: /scratchbox/tools/lib/python2.3 seems to be missing subprocess on my installation