anchor.diff:        enableAdobeFlashDRM = true;
       };
   
  -    packageOverrides = pkgs : rec {
  +    packageOverrides = pkgs : {
  +      base-env = pkgs.buildEnv {
  +        name = "base-env";
  +        paths = base-tools;
  +      };
  +
         dev-env = pkgs.buildEnv {
           name = "dev-env";
           paths =
  -          nix-tools
  -          ++ linux-tools
  -          ++ network-tools
  +          base-tools
             ++ security-tools
             ++ desktop-apps
  -          ++ dev-tools
             ++ x11-tools
  -          ++ music-apps
             ++ go-env
             ++ node-env
             ++ ocaml-env
  
positive.code:     ];
    };
  
    music-apps = pkg-set {
      linux = [
        ncmpcpp
        mpc_cli
      ];
    };
  
    node-env = [
      nodejs-8_x
      eslint
  
negative.code:       curl
        ipcalc
        nmap
        tcpdump
        wget
        bind
  