anchor.diff:      "-Ddri-search-path=${libglvnd.driverLink}/lib/dri"
   
       "-Dplatforms=${concatStringsSep "," eglPlatforms}"
  -    "-Ddri-drivers=${concatStringsSep "," driDrivers}"
       "-Dgallium-drivers=${concatStringsSep "," galliumDrivers}"
       "-Dvulkan-drivers=${concatStringsSep "," vulkanDrivers}"
   
  
positive.code:       "ftp://ftp.freedesktop.org/pub/mesa/${version}/mesa-${version}.tar.xz"
        "ftp://ftp.freedesktop.org/pub/mesa/older-versions/${branch}.x/${version}/mesa-${version}.tar.xz"
      ];
      sha256 = "19wx5plk6z0hhi0zdzxjx8ynl3lhlc5mbd8vhwqyk92kvhxjf3g7";
    };
  
    # TODO:
  
negative.code: , libelf, libvdpau
  , libglvnd, libunwind
  , galliumDrivers ? ["auto"]
  , vulkanDrivers ? ["auto"]
  , eglPlatforms ? [ "x11" ] ++ lib.optionals stdenv.isLinux [ "wayland" ]
  , OpenGL, Xplugin
  