anchor.diff:    
     environment.systemPackages = with pkgs; [
       xpdf
  -    #nixops
  -    nixbang
  -    packer
       firefox
       awscli
       #keybase-node-client
  
positive.code:     chromium.enablePepperFlash = true;
      chromium.enablePepperPDF = true;
  
      packageOverrides = pkgs: {
        linux_3_17 = pkgs.linux_3_17.override {
          extraConfig =
          ''
            THUNDERBOLT m
          '';
        };
      };
    };
  
  }
  
negative.code: { config, pkgs, ... }:
  
  let
  
  in
  {
    imports =
  