anchor.diff:              LD_LIBRARY_PATH = "${xorg.libX11}/lib:${xorg.libXext}/lib:${kernelPackages.nvidia_x11_legacy96}/lib";
             } // optionalAttrs (elem "nvidiaLegacy173" driverNames) {
               LD_LIBRARY_PATH = "${xorg.libX11}/lib:${xorg.libXext}/lib:${kernelPackages.nvidia_x11_legacy173}/lib";
  +          } // optionalAttrs (elem "nvidiaLegacy304" driverNames) {
  +            LD_LIBRARY_PATH = "${xorg.libX11}/lib:${xorg.libXext}/lib:${kernelPackages.nvidia_x11_legacy304}/lib";
             } // optionalAttrs (elem "ati_unfree" driverNames) {
               LD_LIBRARY_PATH = "${xorg.libX11}/lib:${xorg.libXext}/lib:${kernelPackages.ati_drivers_x11}/lib:${kernelPackages.ati_drivers_x11}/X11R6/lib64/modules/linux";
               XORG_DRI_DRIVER_PATH = "${kernelPackages.ati_drivers_x11}/lib/dri"; # is ignored because ati drivers ship their own unpatched libglx.so !
  
positive.code:       optional (elem "nvidia" driverNames) kernelPackages.nvidia_x11 ++
        optional (elem "nvidiaLegacy96" driverNames) kernelPackages.nvidia_x11_legacy96 ++
        optional (elem "nvidiaLegacy173" driverNames) kernelPackages.nvidia_x11_legacy173 ++
        optional (elem "virtualbox" driverNames) kernelPackages.virtualboxGuestAdditions ++
        optional (elem "ati_unfree" driverNames) kernelPackages.ati_drivers_x11;
  
  
negative.code:       ++ optional (elem "nvidia" driverNames) kernelPackages.nvidia_x11
        ++ optional (elem "nvidiaLegacy96" driverNames) kernelPackages.nvidia_x11_legacy96
        ++ optional (elem "nvidiaLegacy173" driverNames) kernelPackages.nvidia_x11_legacy173
        ++ optional (elem "nvidiaLegacy304" driverNames) kernelPackages.nvidia_x11_legacy304
        ++ optional (elem "virtualbox" driverNames) xorg.xrefresh
        ++ optional (elem "ati_unfree" driverNames) kernelPackages.ati_drivers_x11;
  
  