pyqt6 cannot be installed on glibc<2.35 systems

[poautran]

In GitLab by @woutdenolf on Nov 1, 2025, 11:56 GMT+1:

https://www.riverbankcomputing.com/pipermail/pyqt/2025-October/046349.html

Works fine on ub24.04

ldd --version
ldd (Ubuntu GLIBC 2.39-0ubuntu8.6) 2.39

pip install pyqt6==6.10

Fails on ub20.04

ldd --version
ldd (Ubuntu GLIBC 2.31-0ubuntu9.18) 2.31


pip install pyqt6==6.10

Skipping link: none of the wheel's tags are compatible
Querying qmake about your Qt installation...

Traceback (most recent call last):
    File "/users/denolf/.local/wdnbashutils/virtualenvs/pybox_AxiJ54/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
      main()
    File "/users/denolf/.local/wdnbashutils/virtualenvs/pybox_AxiJ54/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
      json_out["return_val"] = hook(**hook_input["kwargs"])
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/users/denolf/.local/wdnbashutils/virtualenvs/pybox_AxiJ54/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 178, in prepare_metadata_for_build_wheel
      whl_basename = backend.build_wheel(metadata_directory, config_settings)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/pip-build-env-7wspgx55/overlay/lib/python3.12/site-packages/sipbuild/api.py", line 28, in build_wheel
      project = AbstractProject.bootstrap('wheel',
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/pip-build-env-7wspgx55/overlay/lib/python3.12/site-packages/sipbuild/abstract_project.py", line 74, in bootstrap
      project.setup(pyproject, tool, tool_description)
    File "/tmp/pip-build-env-7wspgx55/overlay/lib/python3.12/site-packages/sipbuild/project.py", line 677, in setup
      self.update(tool)
    File "/tmp/pip-install-vwhc2f_0/pyqt6_c5cf983a310e45d6b5837951125866e3/project.py", line 163, in update
      raise UserException(
  sipbuild.exceptions.UserException
  error: subprocess-exited-with-error

Migrated from GitLab: https://gitlab.esrf.fr/workflow/ewoks/ewoksorange/-/issues/68

[poautran]

In GitLab by @tvincent on Nov 3, 2025, 09:52 GMT+1:

Using --only-binary PyQt6 selects PyQt6 6.9.

I also recall having some trouble with missing X libs on ub20.04 when trying to run GUIs with Qt6.