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Cannot pip install igwn-auth-utils==1.3.0 on empty linux images

Attempting pip install igwn-auth-utils==1.3.0 in a pristine Linux image fails:

$ python3 -m pip install igwn-auth-utils==1.3.0
Collecting igwn-auth-utils==1.3.0
  Downloading igwn_auth_utils-1.3.0-py3-none-any.whl (34 kB)
Collecting cryptography>=44.0.1
  Downloading cryptography-44.0.2-cp39-abi3-manylinux_2_34_x86_64.whl (4.2 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 4.2/4.2 MB 19.1 MB/s eta 0:00:00
Collecting gssapi>=1.9.0
  Downloading gssapi-1.9.0.tar.gz (94 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 94.3/94.3 kB 10.5 MB/s eta 0:00:00
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error

  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [25 lines of output]
      /bin/sh: 1: krb5-config: not found
      Traceback (most recent call last):
        File "//venv/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "//venv/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 "//venv/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
                 ^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-3qh2gj3g/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 334, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=[])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-3qh2gj3g/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 304, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-3qh2gj3g/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 320, in run_setup
          exec(code, locals())
        File "<string>", line 109, in <module>
        File "<string>", line 22, in get_output
        File "/usr/lib/python3.11/subprocess.py", line 466, in check_output
          return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/usr/lib/python3.11/subprocess.py", line 571, in run
          raise CalledProcessError(retcode, process.args,
      subprocess.CalledProcessError: Command 'krb5-config --libs gssapi' returned non-zero exit status 127.
      [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 wheel 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.

The gssapi requirement needs to be made optional.