anchor.diff:        tree
         apg
         postgresql
  +      qtcreator
       ];
     };
   
  
positive.code:       xclip
        xorg.xdpyinfo
        xorg.xev
      ];
    };
  
  
negative.code:           ++ x11-tools
            ++ music-apps
            ++ go-env
            ++ node-env
            ++ python2-env;
        };
      };
    }
  