anchor.diff:  let
     # Release calendar: https://www.mesa3d.org/release-calendar.html
     # Release frequency: https://www.mesa3d.org/releasing.html#schedule
  -  version = "21.3.8";
  +  version = "22.0.1";
     branch  = versions.major version;
   
   self = stdenv.mkDerivation {
  
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
  