nixos/nvidia: make libXNVCtrl available on nvidia systems

            KERNEL=="nvidia_uvm", RUN+="${pkgs.runtimeShell} -c 'mknod -m 666 /dev/nvidia-uvm-tools c $$(grep nvidia-uvm /proc/devices | cut -d \  -f 1) 1'"

          '';

          hardware.opengl = {

            extraPackages = [ nvidia_x11.out ];

            extraPackages = [ nvidia_x11.out nvidia_x11.settings.libXNVCtrl ];

            extraPackages32 = [ nvidia_x11.lib32 ];

          };

          environment.systemPackages = [ nvidia_x11.bin ];