anchor.diff:    vehicle_game = buildDemo rec {
       name = "ue4demos-vehicle_game";
       src = fetchurl {
  -      url = "http://ue4linux.raxxy.com/vehicle_game.zip";
  +      urls = urls "vehicle_game.zip";
         sha256 = "03dlacf1iv7sgn7pl3sx9r6243wy8fsi2kd858syfm9slg0190bs";
       };
     };
  
positive.code:   reflections_subway = buildDemo rec {
      name = "ue4demos-reflections_subway";
      src = fetchurl {
        url = "http://ue4linux.raxxy.com/reflections_subway_demo.zip";
        sha256 = "0dw5sm7405gxw9iqz0vpnhdprrb4wl5i14pvzl1381k973m8bd00";
      };
    };
  
negative.code:   landscape_mountains = buildDemo rec {
      name = "ue4demos-landscape_mountains";
      src = fetchurl {
        urls = urls "landscape_mountains.zip";
        sha256 = "14jzajhs3cpydvf3ag7lpj4hkpbjpwnn3xkdvdx92fi0pcl8cwym";
      };
    };
  