compilation error in etree.c with python 3.11

[Laurent Nicolas]

This issue is seen with python 3.11.
Some googling suggests that the version of cython may need to be updated.

src/lxml/etree.c:265439:14: error: dereferencing pointer to incomplete type ‘PyFrameObject’ {aka ‘struct _frame’}

Collecting lxml
  Downloading lxml-4.8.0.tar.gz (3.2 MB)
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'

  Building wheel for lxml (setup.py): started
  Building wheel for lxml (setup.py): finished with status 'error'
  ERROR: Command errored out with exit status 1:
   command: /usr/bin/python3.11 -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-qsynd35b/lxml_18b347b16c714608b56cbfd77d7984f6/setup.py'"'"'; __file__='"'"'/tmp/pip-install-qsynd35b/lxml_18b347b16c714608b56cbfd77d7984f6/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-k09g8t_2
       cwd: /tmp/pip-install-qsynd35b/lxml_18b347b16c714608b56cbfd77d7984f6/
  Complete output (14 lines):
  Building lxml version 4.8.0.
  Building without Cython.
  Building against libxml2 2.9.10 and libxslt 1.1.34
  running bdist_wheel
  running build
  running build_py
  running build_ext
  building 'lxml.etree' extension
  src/lxml/etree.c: In function ‘__Pyx_Coroutine_SendEx’:
  src/lxml/etree.c:265439:14: error: dereferencing pointer to incomplete type ‘PyFrameObject’ {aka ‘struct _frame’}
  265439 | f->f_back = PyThreadState_GetFrame(tstate);
         | ^~
  Compile failed: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1
  error: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1

[Laurent Nicolas (lonico77)]

thank you!