anchor.diff:  { stdenv
   , buildPythonPackage
   , fetchFromGitHub
  +, isPy3k
   , pythonPackages
   
   , acme
   , ConfigArgParse
   , configobj
   , cryptography
  +, dialog
   , parsedatetime
  -, pkgs
   , psutil
   , pyopenssl
   , python2-pythondialog
  
positive.code: , zope-interface
  }:
  
  let
    inherit (pythonPackages)
      isPy3k;
  in
  buildPythonPackage rec {
    name = "certbot-${version}";
    version = "0.8.1";
  
negative.code:     sha256 = "48c453db74457ac88130480052246c132497fafd81c69e6ff9ff02f33243b855";
    };
  
    propagatedBuildInputs = [
      acme
      ConfigArgParse
      configobj
      cryptography
      dialog
      parsedatetime
      psutil
      pyopenssl
      python2-pythondialog
  