anchor.diff:  , pytest-xdist
   , numpy
   , pybind11
  +, libxcrypt
   }:
   
   buildPythonPackage rec {
  
positive.code: , stdenv
  , fetchPypi
  , python
  , buildPythonPackage
  , cython
  , gfortran
  
negative.code: 
    nativeBuildInputs = [ cython gfortran meson-python pythran pkg-config wheel ];
  
    buildInputs = [
      numpy.blas
      pybind11
    ] ++ lib.optionals (pythonOlder "3.9") [
      libxcrypt
    ];
  
    propagatedBuildInputs = [ numpy ];
  
  