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 = "03vqm9kqrcpijg6bxldj0bg360z8d7c767n3b16jdc1apd4inxdg";
  +    sha256 = "0gakhsj5qgm4wran7nlnz7kzgg3aj0a8f4q4dfbznfnjhnv03q6c";
     };
   
     prePatch = "patchShebangs .";
  
positive.code: let
    # Release calendar: https://www.mesa3d.org/release-calendar.html
    # Release frequency: https://www.mesa3d.org/releasing.html#schedule
    version = "20.3.1";
    branch  = versions.major version;
  in
  
  
negative.code:       url = "https://gitlab.freedesktop.org/mesa/mesa/commit/aebbf819df6d1e.patch";
        sha256 = "17248hyzg43d73c86p077m4lv1pkncaycr3l27hwv9k4ija9zl8q";
      })
      # Fix for pre macOS SDK 10.13:
      (fetchpatch { # util: Disable memstream for Apple builds
        # MR: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8269
        url = "https://gitlab.freedesktop.org/mesa/mesa/-/commit/f4403f70fe5bf2ec41af5546122f0d78caffa984.patch";
        sha256 = "03j2aj255m7ms848nkb41vj3s3yb72zb5rz3w3fzp5l9wzzargw5";
      })
  