It is possible to compile chebpol without FFTW. If this is done, it will not be feasible with high-degree Chebyshev polynomials. I.e. a 100x100x100 approximation will be possible, but not a one-dimensional 1000000. This function checks whether chebpol uses FFTW.
Returns TRUE if chebpol uses FFTW. Otherwise FALSE.
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