anchor.diff:  let
     # Release calendar: https://www.mesa3d.org/release-calendar.html
     # Release frequency: https://www.mesa3d.org/releasing.html#schedule
  -  version = "20.3.1";
  +  version = "20.3.2";
     branch  = versions.major version;
   in
   
  
positive.code:       url = "https://gitlab.freedesktop.org/mesa/mesa/commit/aebbf819df6d1e.patch";
        sha256 = "17248hyzg43d73c86p077m4lv1pkncaycr3l27hwv9k4ija9zl8q";
      })
    ] ++ stdenv.lib.optionals stdenv.isDarwin [
      # Fix for pre macOS SDK 10.13
      # TODO(r-burns) can be applied unconditionally, at the cost of a mass linux rebuild
      (fetchpatch {
        url = "https://gitlab.freedesktop.org/mesa/mesa/-/commit/f4403f70fe5bf2ec41af5546122f0d78caffa984.patch";
        sha256 = "03j2aj255m7ms848nkb41vj3s3yb72zb5rz3w3fzp5l9wzzargw5";
      })
  
negative.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 = "0gakhsj5qgm4wran7nlnz7kzgg3aj0a8f4q4dfbznfnjhnv03q6c";
    };
  
    prePatch = "patchShebangs .";
  