Installing or finding FFTW

[Pepe_Le_Pew]

FFT - Fast Fourier Transformation Problem

Hi, I have a problem concerning fft.h. I used the code as shown in the tutorial fft.C and I always get an error: "Error in TVirtualFFT::FFT handler not found" Break segmentation violation… I also could not start the tutorial-script: When I type ‘root /…path…/root/tutorials/fft/FFT.C’ into the terminal, I get the same error. Can somebody help me??