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