This is a lovely piece of work. Very impressive.
Can you explain the licensing? The library appears at first glance to
contain both original code and (LGPL) code from other authors, the
whole under a GPL licence. To build and run it requires the VST SDK,
but this is licensed incompatibly with the GPL. Does this mean that
nobody (and in particular no Linux distributor) can redistribute a
runnable version of libfst, jack_fst, or any other code that uses
libfst, because they can't satisfy section 3 of the GPL by including
the VST SDK source?
Chris