After installing the windows version of maxima 5.21 and
running the fft example , from the help screen .
I received an error message about not being able to
load fft-core.lisp , just after the load(fft) instruction .
Presently my autoconfig.bat file doesn't point to any
Maxima 5.21 directories ; might this impede the compilation .
As far as I can tell this difficulty is apparent only for the
most recent versions of Maxima ; swapping an earlier
fft.lisp file for the present one alleviates the apparent
difficulty .