anchor.diff: -{ buildPythonPackage
  -, fetchgit
  +{ stdenv
  +, buildPythonPackage
  +, fetchFromGitHub
   , isPy27
   , testfixtures
   , unittest2
  
positive.code: 
  buildPythonPackage rec {
    pname = "serversyncstorage";
    version = "1.6.11";
    disabled = !isPy27;
  
    src = fetchgit {
      url = https://github.com/mozilla-services/server-syncstorage.git;
      rev = "refs/tags/${version}";
      sha256 = "197gj2jfs2c6nzs20j37kqxwi91wabavxnfm4rqmrjwhgqjwhnm0";
    };
  
    checkInputs = [ testfixtures unittest2 webtest ];
  
negative.code:     pymysqlsa umemcache WSGIProxy requests pybrowserid
    ];
  
    meta = with stdenv.lib; {
      description = "The SyncServer server software, as used by Firefox Sync";
      homepage = https://github.com/mozilla-services/server-syncstorage;
      license = licenses.mpl20;
      maintainers = with maintainers; [ nadrieril ];
    };
  }
  