anchor.diff:        "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";
  +    sha256 = "0vs20kyq9sxh52hd242yf7nz2wzw6di8jw7s19pb6q25qn19cpy0";
     };
   
     # TODO:
  
positive.code: let
    # Release calendar: https://www.mesa3d.org/release-calendar.html
    # Release frequency: https://www.mesa3d.org/releasing.html#schedule
    version = "21.3.8";
    branch  = versions.major version;
  
  self = stdenv.mkDerivation {
  
negative.code: , libelf, libvdpau
  , libglvnd, libunwind
  , galliumDrivers ? ["auto"]
  , vulkanDrivers ? ["auto"]
  , eglPlatforms ? [ "x11" ] ++ lib.optionals stdenv.isLinux [ "wayland" ]
  , OpenGL, Xplugin
  