sfftw2 2.1.5-4.2build2 (s390x binary) in ubuntu impish

 This library computes Fast Fourier Transforms (FFT) in one or more dimensions.
 It is extremely fast. This package contains the shared library version of the
 fftw libraries in single precision.
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 To get the static library and the header files you need to install sfftw-dev.
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 For documentation and test programs, install fftw-docs