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I understand more now. So after poking around the sdist from python -m pip download 'xrootd==5.5.2' I think I understand the problem better. Something we all agree on is that if

https://github.com/xrootd/xrootd/blob/76c1f87c3d9cc5ff3432a0daf93361956c7abb08/cmake/XRootDFindLibs.cmake#L182

fails then you'll get an error message like

  -- Could NOT find PythonLibs (missing: PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) (Required is at least version "3.11")

which is uncontroversial. Though if that happens then BUILD_PYTHON is FALSE

https://github.com/xrootd/xrootd/blob/76c1f87c3d9cc5ff3432a0daf93361956c7abb08/cmake/XRootDFindLibs.cmake#L187-L192

and then the directory $startdir/xrootdbuild/bindings/python never gets created

https://github.com/xrootd/xrootd/blob/76c1f87c3d9cc5ff3432a0daf93361956c7abb08/bindings/CMakeLists.txt#L2-L4

and

https://github.com/xrootd/xrootd/blob/76c1f87c3d9cc5ff3432a0daf93361956c7abb08/packaging/wheel/install.sh#L40

fails ungracefully as there is no directory to navigate to.

So there are two problems:

1. CMake is not finding valid Python libraries and include directories for pyenv virtual environments.
2. https://github.com/xrootd/xrootd/blob/76c1f87c3d9cc5ff3432a0daf93361956c7abb08/packaging/wheel/install.sh#L40 isn't guarded from configurations where it doesn't exist.

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