anchor.diff:  , stdenv
   , fetchPypi
   , python
  +, pythonOlder
   , buildPythonPackage
   , cython
   , gfortran
  
positive.code: 
    nativeBuildInputs = [ cython gfortran meson-python pythran pkg-config wheel ];
  
    buildInputs = [ numpy.blas pybind11 ];
  
    propagatedBuildInputs = [ numpy ];
  
  
negative.code: , pytest-xdist
  , numpy
  , pybind11
  , libxcrypt
  }:
  
  buildPythonPackage rec {
  