Since we already do this for cuFFT, it is not hard to support Intel MKL. Some refactoring may be needed, but perhaps worth doing it at a later stage.
EDIT: Issue originates from the DelftBlue supercomputer not having FFTW and recommending to use MKL instead (but Intel MKL does not support the FFTW guru interface, and even though the code will compile the output will be nonsensical).
Since we already do this for cuFFT, it is not hard to support Intel MKL. Some refactoring may be needed, but perhaps worth doing it at a later stage.
EDIT: Issue originates from the DelftBlue supercomputer not having FFTW and recommending to use MKL instead (but Intel MKL does not support the FFTW guru interface, and even though the code will compile the output will be nonsensical).