Tips on porting FFTW

FFTW (the Fastest Fourier Transform in the West) is a nice highly optimized portable FFT library. Paratec can now be compiled to use FFTW on platforms where it is available with only minimal changes needed. This should make it easier to port paratec.

To make FFTW work on a new platform, make sure the sysvars file includes the path of the FFTW library (for example, see sysvars.sgio200). Secondly, you must make sure that if the platform also supports a native FFT package that M4FFTFLAG is defined (again, see sgio200), and that adjustfft.fp uses that value.

I think that is all that should be needed. When you run the configure script, of course, you must say yes to fftw.