anchor.diff:            ++ x11-tools
             ++ music-apps
             ++ go-env
  -          ++ node-env;
  -      };
  -
  -      python2-tools = pkgs.buildEnv {
  -        name = "python2-tools";
  -        paths = with python27Packages; pkg-set {
  -          all = [
  -            ipython
  -            flake8
  -            virtualenv
  -            Fabric
  -          ];
  -          linux = [ pylint ];
  -        };
  -      };
  -
  -      python3-tools = pkgs.buildEnv {
  -        name = "python3-tools";
  -        paths = with python35Packages; pkg-set {
  -          all = [
  -            ipython
  -            flake8
  -            virtualenv
  -            Fabric
  -          ];
  -          linux = [ pylint ];
  -        };
  +          ++ node-env
  +          ++ python2-env;
         };
       };
     }
  
positive.code:       xclip
        xorg.xdpyinfo
        xorg.xev
      ];
    };
  
  
negative.code:       (ctagsWrapped.ctagsWrapped.override { name = "ctags"; })
        fasd
        gnumake
        direnv
        unzip
        p7zip
  