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:         ];
    };
  
    python34env = buildEnv { 
      name = "Python34Env";
      paths = [
          libxml2
  
negative.code:   devtools = buildEnv {
      name = "devtools";
      paths = [
          git
          gitAndTools.tig
          ];
    };
  