anchor.diff:          ];
     };
   
  -  python34env = buildEnv { 
  +  python34env = buildEnv {
       name = "Python34Env";
       paths = [
           libxml2
  
positive.code:   devtools = buildEnv {
      name = "devtools";
      paths = [
          git 
          gitAndTools.tig
          ];
    };
  
negative.code: 
  rec {
  
    # source file so load bash environment with dependencies
    policycompass-env = myEnvFun {
      name = "policycompass";
      buildInputs = with pkgs; [ policycompass ];
      extraCmds =
          "export PYTHONHOME=${python34env}; export PATH=$PATH:${nodejs-env}/bin;"
      ;
    };
  
    # install dependencies
    policycompass = buildEnv {
      name = "policycompass";
      paths = [
  