anchor.diff:  
   buildPythonPackage rec {
     pname = "spectral-cube";
  -  version = "0.4.4";
  +  version = "0.4.5";
   
  -  src = fetchPypi {
  -    inherit pname version;
  -    sha256 = "9051ede204b1e25b6358b5e0e573b624ec0e208c24eb03a7ed4925b745c93b5e";
  +  # Fetch from GitHub instead of PyPi, as 0.4.5 isn't available in PyPi
  +  src = fetchFromGitHub {
  +    owner = "radio-astro-tools";
  +    repo = pname;
  +    rev = "v${version}";
  +    sha256 = "1xc1m6vpl0bm600fx9vypa7zcvwg7yvhgn0w89y6v9d1vl0qcs7z";
     };
   
     propagatedBuildInputs = [ astropy radio_beam ];
  
positive.code: { lib
  , fetchPypi
  , buildPythonPackage
  , astropy
  , radio_beam
  
negative.code:     license = lib.licenses.bsd3;
      platforms = lib.platforms.all;
      maintainers = with lib.maintainers; [ smaret ];
    };
  }
  
  