@chrisburr : thanks for the hint, I just tried adding following pyproject.toml:

[build-system]
requires = ["setuptools>=42", "wheel"]
build-backend = "setuptools.build_meta"

but I'm getting following error on pip install:

Building wheels for collected packages: xrootd
  Building wheel for xrootd (PEP 517) ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/bin/python3 /usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py build_wheel /tmp/tmpex2e8sfb
       cwd: /tmp/pip-req-build-8t0nnog9
  Complete output (22 lines):
  running bdist_wheel
  Traceback (most recent call last):
    File "/tmp/pip-build-env-aw7t30tw/overlay/lib/python3.6/site-packages/setuptools/build_meta.py", line 105, in _file_with_extension
      file, = matching
  ValueError: not enough values to unpack (expected 1, got 0)
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 349, in <module>
      main()
    File "/usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 331, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 249, in build_wheel
      metadata_directory)
    File "/tmp/pip-build-env-aw7t30tw/overlay/lib/python3.6/site-packages/setuptools/build_meta.py", line 222, in build_wheel
      wheel_directory, config_settings)
    File "/tmp/pip-build-env-aw7t30tw/overlay/lib/python3.6/site-packages/setuptools/build_meta.py", line 210, in _build_with_temp_dir
      tmp_dist_dir, result_extension)
    File "/tmp/pip-build-env-aw7t30tw/overlay/lib/python3.6/site-packages/setuptools/build_meta.py", line 108, in _file_with_extension
      'No distribution was found. Ensure that `setup.py` '
  ValueError: No distribution was found. Ensure that `setup.py` is not empty and that it calls `setup()`.
  ----------------------------------------
  ERROR: Failed building wheel for xrootd
Failed to build xrootd
ERROR: Could not build wheels for xrootd which use PEP 517 and cannot be installed directly

any idea what is amiss?

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