Library for computing Fast Fourier Transforms - Long precision

 The FFTW library computes Fast Fourier Transforms (FFT) in one or more
 dimensions. It is extremely fast. This package contains the shared library
 for long double precision transforms.
 .
 To get the static library and the header files, you need to install
 libfftw3-dev. For documentation, see libfftw3-doc.