anchor.diff:        $out/lib/libxatracker* \
         $out/lib/libvulkan_*
   
  -    # move share/vulkan/icd.d/
  -    mv $out/share/ $drivers/
  -    # Update search path used by Vulkan (it's pointing to $out but
  -    # drivers are in $drivers)
  -    for js in $drivers/share/vulkan/icd.d/*.json; do
  -      substituteInPlace "$js" --replace "$out" "$drivers"
  -    done
  -
       mv $out/lib/dri/* $drivers/lib/dri # */
       rmdir "$out/lib/dri"
   
  
positive.code:     "--with-dri-driverdir=$(drivers)/lib/dri"
      "--with-dri-searchpath=${driverLink}/lib/dri"
      "--with-egl-platforms=x11,wayland,drm"
    ]
      ++ optionals (stdenv.system != "armv7l-linux") [
        "--with-gallium-drivers=svga,i915,ilo,r300,r600,radeonsi,nouveau,freedreno,swrast"
        "--with-dri-drivers=i915,i965,nouveau,radeon,r200,swrast"
        "--with-vulkan-drivers=intel"
    ]
      ++ [
      (enableFeature enableTextureFloats "texture-float")
      (enableFeature grsecEnabled "glx-rts")
      (enableFeature stdenv.isLinux "dri3")
  
negative.code: 
      # set the default search path for DRI drivers; used e.g. by X server
      substituteInPlace "$dev/lib/pkgconfig/dri.pc" --replace '$(drivers)' "${driverLink}"
    '' + optionalString (!(stdenv.isArm || stdenv.isAarch64)) ''
      # move share/vulkan/icd.d/
      mv $out/share/ $drivers/
      # Update search path used by Vulkan (it's pointing to $out but
      # drivers are in $drivers)
      for js in $drivers/share/vulkan/icd.d/*.json; do
        substituteInPlace "$js" --replace "$out" "$drivers"
      done
    '';
  
    # TODO:
  