ruby-fftw3 0.4.2-2build3 (s390x binary) in ubuntu xenial

 Ruby-FFTW3 is the Ruby interface to the FFTW Ver.3 library.
 Features:
   - Use NArray, which is an efficient multi-dimensional numeric array
     class for Ruby
   - Multi-dimensional complex FFT.(Real data are coerced to complex)
   - Supports both double and single float transforms.
   - Not normalized as in FFTW