anchor.diff:  
     nativeBuildInputs = [
       astropy-extension-helpers
  -    astropy-helpers
       cython
       setuptools-scm
     ];
  
positive.code:     pytestCheckHook
    ];
  
    preCheck = ''
      cd build/lib*
    '';
  
    pythonImportsCheck = [
      "reproject"
  
negative.code:   propagatedBuildInputs = [
      astropy
      astropy-healpix
      numpy
      scipy
    ];
  