python-pyqt6 fails to build with Python 3.13.0a1.

WARNING: Couldn't create 'sipbuild.generator.parser.parsetab'. [Errno 13] Permission denied: '/usr/lib64/python3.13/site-packages/sipbuild/generator/parser/parsetab.py'
Generating the QtCore .api file...
Generating the QtCore .pyi file...
sip-build: An internal error occurred...
Traceback (most recent call last):
  File "/usr/bin/sip-build", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/lib64/python3.13/site-packages/sipbuild/tools/build.py", line 37, in main
    handle_exception(e)
  File "/usr/lib64/python3.13/site-packages/sipbuild/exceptions.py", line 81, in handle_exception
    raise e
  File "/usr/lib64/python3.13/site-packages/sipbuild/tools/build.py", line 34, in main
    project.build()
  File "/usr/lib64/python3.13/site-packages/sipbuild/project.py", line 245, in build
    self.builder.build()
  File "/usr/lib64/python3.13/site-packages/sipbuild/builder.py", line 48, in build
    self._generate_bindings()
  File "/usr/lib64/python3.13/site-packages/sipbuild/builder.py", line 280, in _generate_bindings
    buildable = bindings.generate()
                ^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/site-packages/sipbuild/bindings.py", line 214, in generate
    output_pyi(spec, project, pyi_path)
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/pyi.py", line 53, in output_pyi
    _module(pf, spec, module)
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/pyi.py", line 132, in _module
    _class(pf, spec, module, klass, defined)
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/pyi.py", line 282, in _class
    _ctor(pf, spec, module, ctor, nr_overloads > 1, defined, indent)
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/pyi.py", line 356, in _ctor
    as_str = _argument(spec, module, arg, defined, arg_nr=arg_nr)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/pyi.py", line 676, in _argument
    s += _type(spec, module, arg, defined, out=out)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/pyi.py", line 710, in _type
    return ArgumentFormatter(spec, arg).as_type_hint(module, out, defined)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/formatters/argument.py", line 327, in as_type_hint
    s += TypeHintManager(self.spec).as_type_hint(hint, out, context,
         ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/site-packages/sipbuild/generator/outputs/type_hints.py", line 107, in __new__
    manager = cls._spec_manager_map[spec]
              ~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/usr/lib64/python3.13/weakref.py", line 415, in __getitem__
    return self.data[ref(key)]
           ~~~~~~~~~^^^^^^^^^^
  File "<string>", line 4, in __eq__
  File "<string>", line 4, in __eq__
  File "<string>", line 4, in __eq__
  [Previous line repeated 495 more times]
RecursionError: maximum recursion depth exceeded in comparison

https://docs.python.org/3.13/whatsnew/3.13.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.13/fedora-rawhide-x86_64/06593990-python-pyqt6/

For all our attempts to build python-pyqt6 with Python 3.13, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/package/python-pyqt6/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.13:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/

Let us know here if you have any questions.

Python 3.13 is planned to be included in Fedora 41.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.13.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.