anchor.diff:      chromium.enablePepperFlash = true;
       chromium.enablePepperPDF = true;
   
  -    packageOverrides = pkgs: {
  -      linux_3_17 = pkgs.linux_3_17.override {
  -        extraConfig =
  -        ''
  -          THUNDERBOLT m
  -        '';
  -      };
  -    };
     };
   
   }
  
positive.code:     gnumake
      python27Packages.pip
      pypy
      linuxPackages_3_4.virtualbox
      mtr
      xclip
      terminus_font
  
negative.code:   
    environment.systemPackages = with pkgs; [
      xpdf
      firefox
      awscli
      #keybase-node-client
  