Install on debian12 fails

When try to install it in the ckan 2.10.3 under debian 12 - the installation fails with following error:

(default) ckan@debian:/usr/lib/ckan/default/src$ pip install -e "git+https://github.com/ckan/ckanext-spatial.git#egg=ckanext-spatial"
Obtaining ckanext-spatial from git+https://github.com/ckan/ckanext-spatial.git#egg=ckanext-spatial
Updating /usr/lib/ckan/default/src/ckanext-spatial clone
Running command git fetch -q --tags
Running command git reset --hard -q 938308469892e4bcf7389cb4adee5ccdd5a0ccca
Running command git submodule update --init --recursive -q
Installing build dependencies ... done
Checking if build backend supports build_editable ... done
Getting requirements to build editable ... error
error: subprocess-exited-with-error

× Getting requirements to build editable did not run successfully.
│ exit code: 1
╰─> [23 lines of output]
Traceback (most recent call last):
File "/usr/lib/ckan/default/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in
main()
File "/usr/lib/ckan/default/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
json_out['return_val'] = hook(**hook_input['kwargs'])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/ckan/default/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 132, in get_requires_for_build_editable
return hook(config_settings)
^^^^^^^^^^^^^^^^^^^^^
File "/tmp/pip-build-env-gmm2uv4x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 441, in get_requires_for_build_editable
return self.get_requires_for_build_wheel(config_settings)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/tmp/pip-build-env-gmm2uv4x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 325, in get_requires_for_build_wheel
return self._get_build_requires(config_settings, requirements=['wheel'])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/tmp/pip-build-env-gmm2uv4x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 295, in _get_build_requires
self.run_setup()
File "/tmp/pip-build-env-gmm2uv4x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 480, in run_setup
super(_BuildMetaLegacyBackend, self).run_setup(setup_script=setup_script)
File "/tmp/pip-build-env-gmm2uv4x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 311, in run_setup
exec(code, locals())
File "", line 2, in
ModuleNotFoundError: No module named 'ckanext.spatial'
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build editable did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

adopted package list for apt:
apt-get install python3-dev libxml2-dev libxslt1-dev libgeos-c1v5

other extensions like ckanext-scheming work as expected

best regards from germany,

armin

Reproduce the editable install command for ckanext-spatial from CKAN 2.10.3 on Debian 12 and compare it with the working ckanext-scheming installation. Start with the reported setuptools traceback, especially the missing ckanext.spatial module; done means the extension installs successfully with the documented command.

Written by the indexing model from the issue text.