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+FFTW is a free collection of fast C routines for computing the Discrete
+Fourier Transform in one or more dimensions. It includes complex, real,
+symmetric, and parallel transforms, and can handle arbitrary array sizes
+efficiently. FFTW is typically faster than other publically-available FFT
+implementations, and is even competitive with vendor-tuned libraries.
+
+There are several machine-dependent optimizations that can be enabled in order
+to generate SIMD code; take a look in fftw.SlackBuild to enable them.