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