I really wish we could include this, but my understanding is that both anfft and pyFFTW are fully GPL v3 and are not compatible with our 3-clause BSD license - or your MIT license in the comment block up top. If we so much as link to such a library (I believe imports count as links in this context, legally) the GPL v3 goes viral and all of our code theretofore would have to be less permissively licensed.

It's really, really too bad. FFTW is a great library, and used to be included in NumPy or SciPy... but then they revised their licensing and it had to be excised to maintain the permissive license structure around the SciPy Stack. I wish an LGPL version were available.

If I'm wrong about any of this (and I'd *love* to be wrong about it), someone please correct me.