What does NOT work
==================

One important target missing is windows 64, but this should not be too
difficult to solve.

There are still many corner cases not yet solved (in particular some
windows things, most libraries path cannot yet be overriden in
site.cfg); also, I do not attempt to be 100 % backward compatible with
the current build system (that for a given environment, you won't
necessarily have the same build options). Some things are not yet
supported either (overriding libraries with env variables, for example,
is not supported).