anchor.diff:    };
     supervisordev34 = buildPythonPackage {
        name = "supervisordev34";
  -     buildInputs = [ python34 meld334 ];
  -     src = pkgs.fetchurl {
  -        url = https://github.com/Supervisor/supervisor/archive/master.zip;
  -        sha256 = "f292f520aeea8159ba281eef52a4c94c53cf4b2b8e090ecb9fa884f2205f26e2";
  +     buildInputs = [ python34 python34Packages.mock ];
  +     src = pkgs.fetchgit {
  +        url = https://github.com/Supervisor/supervisor.git;
  +        rev = "7e4e41b1f7e955de6d0963972695d6704ebeaf6a";
  +        sha256 = "1jp52d2n16912kh3gig1ms5qc90zamn6p8axmyn9y5v23h61iw1n";
        };
        propagatedBuildInputs = [ meld334 ];
     };
  -  
  +
     pyflakes = stdenv.lib.overrideDerivation python34Packages.pyflakes (oldAttrs: {
        name = "pyflakes-0.8.1";
        src = fetchurl {
          url = "http://pypi.python.org/packages/source/p/pyflakes/pyflakes-0.8.1.tar.gz";
          md5 = "905fe91ad14b912807e8fdc2ac2e2c23";
        };
  -   }); 
  -
  +   });
   }
  
positive.code:         ];
    };
  
    python34env = buildEnv { 
      name = "Python34Env";
      paths = [
          libxml2
  
negative.code:   devtools = buildEnv {
      name = "devtools";
      paths = [
          git
          gitAndTools.tig
          ];
    };
  