previously it worked
(cffi:define-foreign-type _-off-64-t () '_-quad-t) (cffi:define-foreign-type _-quad-t () ':long-long)
but cffi also fails with this, due to the load order (which, if needed to be fixed on the verrazano side, would be a big headache):
hm, i was fooled by the original verrazano impl. as i understand it now, cffi:defctype should be used here instead, but using that also leads to the same load order problem.