anchor.diff:  
   buildPythonPackage rec {
     pname = "scipy";
  -  version = "1.6.3";
  +  version = "1.7.1";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "a75b014d3294fce26852a9d04ea27b5671d86736beb34acdfc05859246260707";
  +    sha256 = "6b47d5fa7ea651054362561a28b1ccc8da9368a39514c1bbf6c0977a1c376764";
     };
   
  +  nativeBuildInputs = [ cython gfortran pythran ];
  +
  +  buildInputs = [ numpy.blas pybind11 ];
  +
  +  propagatedBuildInputs = [ numpy ];
  +
     checkInputs = [ nose pytest pytest-xdist ];
  -  nativeBuildInputs = [ gfortran ];
  -  buildInputs = [ numpy.blas pybind11 ];
  -  propagatedBuildInputs = [ numpy ];
   
     # Remove tests because of broken wrapper
     prePatch = ''
  
positive.code: , fetchPypi
  , python
  , buildPythonPackage
  , gfortran
  , nose
  , pytest
  , pytest-xdist
  
negative.code:   preBuild = ''
      ln -s ${numpy.cfg} site.cfg
    '';
  
    # disable stackprotector on aarch64-darwin for now
    #
  