anchor.diff:  
   rec {
   
  -  # source file so load bash environment with dependencies 
  +  # source file so load bash environment with dependencies
     policycompass-env = myEnvFun {
       name = "policycompass";
       buildInputs = with pkgs; [ policycompass ];
  -    extraCmds = 
  +    extraCmds =
           "export PYTHONHOME=${python34env}; export PATH=$PATH:${nodejs-env}/bin;"
       ;
     };
   
  -  # install dependencies 
  +  # install dependencies
     policycompass = buildEnv {
       name = "policycompass";
       paths = [
  
positive.code:   };
    supervisordev34 = buildPythonPackage {
       name = "supervisordev34";
       buildInputs = [ python34 meld334 ];
       src = pkgs.fetchurl {
          url = https://github.com/Supervisor/supervisor/archive/master.zip;
          sha256 = "f292f520aeea8159ba281eef52a4c94c53cf4b2b8e090ecb9fa884f2205f26e2";
       };
       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";
       };
     }); 
  
  }
  
negative.code:         ];
    };
  
    python34env = buildEnv {
      name = "Python34Env";
      paths = [
          libxml2
  