anchor.diff:  
   buildPythonPackage rec {
     pname = "scrapy";
  -  version = "2.5.0";
  +  version = "2.5.1";
     disabled = pythonOlder "3.6";
   
  -  src = fetchFromGitHub {
  -    owner = pname;
  -    repo = pname;
  -    rev = version;
  -    sha256 = "09lxnjz1cw37i9bgk8sci2xxknj20gi2lq8l7i0b3xw7q8bxzp7h";
  +  src = fetchPypi {
  +    inherit version;
  +    pname = "Scrapy";
  +    sha256 = "13af6032476ab4256158220e530411290b3b934dd602bb6dacacbf6d16141f49";
     };
   
     nativeBuildInputs = [
  
positive.code: , buildPythonPackage
  , cryptography
  , cssselect
  , fetchFromGitHub
  , fetchpatch
  , glibcLocales
  , installShellFiles
  
negative.code:     (fetchpatch {
        name = "remove-h2.patch";
        url = "https://github.com/scrapy/scrapy/commit/c5b1ee810167266fcd259f263dbfc0fe0204761a.patch";
        sha256 = "0sa39yx9my4nqww8a12bk9zagx7b56vwy7xpxm4xgjapjl6mcc0k";
        excludes = [ "tox.ini" ];
      })
    ];
  
  