Finding an Alternative to FFTW for 2D Complex FFTs

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foton7
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Does anyone know a good free library to do Fourier Transforms (FFT or DFT). I know FFTW but I'm having some problems with it. I want an alternative that do FFT in two dimensions with complex numbers. The libraries I have found doesn't fulfill this requirements.

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FFTW is the standard. What problems are you having?
 

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