anchor.diff: -{ stdenv, fetchurl, pkgs, pythonPackages }:
  +{ stdenv, fetchurl, pkgs, python3Packages }:
   
  -pythonPackages.buildPythonApplication rec {
  +python3Packages.buildPythonApplication rec {
     version = "0.7.0";
     name = "khal-${version}";
   
  
positive.code:     sha256 = "00llxj7cv31mjsx0j6zxmyi9s1q20yvfkn025xcy8cv1ylfwic66";
    };
  
    propagatedBuildInputs = with pythonPackages; [
      atomicwrites
      click
      configobj
  
negative.code:     requests_toolbelt
      tzlocal
      urwid
      pkginfo
    ];
  
  