cmake install script fails on Windows

[iAnyKey]

Installation fails on build_py.

how to reproduce

1. configure and build flann in release
2. from elevated terminal issue cmake --install .

results in

-- Install configuration: "Release"
-- Up-to-date: C:/Program Files (x86)/flann/lib/cmake/flann/flann-config.cmake
-- Up-to-date: C:/Program Files (x86)/flann/lib/cmake/flann/flann-config-version.cmake
-- Up-to-date: C:/Program Files (x86)/flann/lib/cmake/flann/flann-targets.cmake
-- Up-to-date: C:/Program Files (x86)/flann/lib/cmake/flann/flann-targets-release.cmake
-- Up-to-date: C:/Program Files (x86)/flann/bin/msvcp140.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin/msvcp140_1.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin/msvcp140_2.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin/msvcp140_atomic_wait.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin/msvcp140_codecvt_ids.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin/vcruntime140_1.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin/vcruntime140.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin/concrt140.dll
-- Up-to-date: C:/Program Files (x86)/flann/bin
-- Up-to-date: C:/Program Files (x86)/flann/lib/pkgconfig/flann.pc
-- Up-to-date: C:/Program Files (x86)/flann/lib/flann_cpp.lib
-- Up-to-date: C:/Program Files (x86)/flann/bin/flann_cpp.dll
-- Up-to-date: C:/Program Files (x86)/flann/lib/flann_cpp_s.lib
-- Up-to-date: C:/Program Files (x86)/flann/lib/flann.lib
-- Up-to-date: C:/Program Files (x86)/flann/bin/flann.dll
-- Up-to-date: C:/Program Files (x86)/flann/lib/flann_s.lib
-- Up-to-date: C:/Program Files (x86)/flann/include/flann
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/all_indices.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/autotuned_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/center_chooser.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/composite_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/dist.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/hierarchical_clustering_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/kdtree_cuda_3d_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/kdtree_cuda_builder.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/kdtree_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/kdtree_single_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/kmeans_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/linear_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/lsh_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/algorithms/nn_index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/config.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/defines.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/flann.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/flann.hpp
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/general.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/io
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/io/hdf5.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/mpi
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/mpi/client.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/mpi/index.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/mpi/matrix.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/mpi/queries.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/mpi/server.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/nn
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/nn/ground_truth.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/nn/index_testing.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/nn/simplex_downhill.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/allocator.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/any.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/cuda
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/cuda/heap.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/cuda/result_set.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/cutil_math.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/dynamic_bitset.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/heap.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/logger.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/lsh_table.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/matrix.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/object_factory.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/params.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/random.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/result_set.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/sampling.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/saving.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/serialization.h
-- Up-to-date: C:/Program Files (x86)/flann/include/flann/util/timer.h
-- Up-to-date: C:/Program Files (x86)/flann/share/flann/python/pyflann
-- Up-to-date: C:/Program Files (x86)/flann/share/flann/python/pyflann/exceptions.py
-- Up-to-date: C:/Program Files (x86)/flann/share/flann/python/pyflann/flann_ctypes.py
-- Up-to-date: C:/Program Files (x86)/flann/share/flann/python/pyflann/index.py
-- Up-to-date: C:/Program Files (x86)/flann/share/flann/python/pyflann/__init__.py
-- Installing: C:/Program Files (x86)/flann/share/flann/python/setup.py
running install
running bdist_egg
running egg_info
writing flann.egg-info\PKG-INFO
writing dependency_links to flann.egg-info\dependency_links.txt
writing top-level names to flann.egg-info\top_level.txt
Traceback (most recent call last):
  File "C:\flann\build\src\python\setup.py", line 18, in <module>
    setup(name='flann',
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\__init__.py", line 153, in setup
    return distutils.core.setup(**attrs)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\core.py", line 148, in setup
    dist.run_commands()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\dist.py", line 966, in run_commands
    self.run_command(cmd)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\dist.py", line 985, in run_command
    cmd_obj.run()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\install.py", line 67, in run
    self.do_egg_install()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\install.py", line 109, in do_egg_install
    self.run_command('bdist_egg')
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\dist.py", line 985, in run_command
    cmd_obj.run()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\bdist_egg.py", line 155, in run
    self.run_command("egg_info")
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\dist.py", line 985, in run_command
    cmd_obj.run()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\egg_info.py", line 299, in run
    self.find_sources()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\egg_info.py", line 306, in find_sources
    mm.run()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\egg_info.py", line 541, in run
    self.add_defaults()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\egg_info.py", line 578, in add_defaults
    sdist.add_defaults(self)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\command\sdist.py", line 226, in add_defaults
    self._add_defaults_python()
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\sdist.py", line 108, in _add_defaults_python
    self.filelist.extend(build_py.get_source_files())
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\command\build_py.py", line 301, in get_source_files
    return [module[-1] for module in self.find_all_modules()]
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\command\build_py.py", line 295, in find_all_modules
    package_dir = self.get_package_dir(package)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\site-packages\setuptools\command\build_py.py", line 174, in get_package_dir
    res = orig.build_py.get_package_dir(self, package)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\distutils\command\build_py.py", line 165, in get_package_dir
    return os.path.join(*tail)
  File "C:\Users\_\AppData\Local\Programs\Python\Python310\lib\ntpath.py", line 78, in join
    path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not NoneType
-- Up-to-date: C:/Program Files (x86)/flann/bin/flann_example_c.exe