anchor.diff:        name = "nine_debug-Make-tid-more-type-correct";
         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";
       })
     ];
   
  
positive.code: let
    # Release calendar: https://www.mesa3d.org/release-calendar.html
    # Release frequency: https://www.mesa3d.org/releasing.html#schedule
    version = "20.3.2";
    branch  = versions.major version;
  in
  
  
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 = "0mnic7mfv5lgnn3swj7lbif8bl8pi2czlgr01jhq5s9q90nj2kpp";
    };
  
    prePatch = "patchShebangs .";
  