anchor.diff:  , buildPythonPackage
   , fetchTritonPatch
   , fetchurl
  -, pythonPackages
  +, isPy3k
  +, lib
   
   , paramiko
   , pycurl
  
positive.code: 
    disabled = isPy3k;
  
    meta = with stdenv.lib; {
      description = "Bazaar is a distributed version control system";
      homepage = http://bazaar-vcs.org/;
      license = licenses.gpl2;
  
negative.code: }:
  
  let
    versionMajor = "2.7";
    versionMinor = "0";
    version = "${versionMajor}.${versionMinor}";
  in
  buildPythonPackage rec {
    name = "bazaar-${version}";
  
    src = fetchurl {
      url = "http://launchpad.net/bzr/${versionMajor}/${version}/+download/"
  