libopenblas-dev 0.3.21+ds-3 (s390x binary) in ubuntu lunar

 OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.
 .
 On amd64, arm64, i386, ppc64el, s390x, kfreebsd-amd64 and kfreebsd-i386,
 all kernels are included in the library and the one matching best your
 processor is selected at runtime.
 .
 On other architectures, for maximum performance, you may want to rebuild
 OpenBLAS locally, see the section: “Building an optimized OpenBLAS package for
 your machine” in README.Debian.
 .
 This package includes the static libraries and symbolic links
 needed for program development.