anchor.diff: -{ lib, buildPythonPackage, fetchFromGitHub, isPy3k, cryptography, chardet, nose, sortedcontainers }:
  +{ lib, buildPythonPackage, fetchFromGitHub, isPy3k, cryptography, chardet, pytestCheckHook }:
   
   buildPythonPackage rec {
     pname = "pdfminer_six";
  -  version = "20201018";
  +  version = "20220319";
   
     disabled = !isPy3k;
   
  
positive.code:     done
    '';
  
    checkInputs = [ nose ];
    checkPhase = ''
      nosetests
    '';
  
    meta = with lib; {
      description = "PDF parser and analyzer";
  
negative.code:     owner = "pdfminer";
      repo = "pdfminer.six";
      rev = version;
      sha256 = "sha256-sjO7jmHSe4EDmJ1rfiXx+lsHxc+DfKeMet37Nbg03WQ=";
    };
  
    propagatedBuildInputs = [ chardet cryptography ];
  
    postInstall = ''
      for file in $out/bin/*.py; do
  