Compiling from source does not copy headers:

• python3 setup.py install does not copy include files (optix.h)
• pip3 install . works because custom_bdist_wheel is executed in setup.py

When using setup.py, get_local_optix_include_path() returns None which results in module creation failure:

module = optix.Module(context=ctx, src=cuda_source, module_compile_options=compile_opts, pipeline_compile_options=pipeline_opts)
  File "optix/module.pyx", line 257, in optix.module.Module.__init__
  File "optix/module.pyx", line 413, in optix.module.Module.compile_cuda_ptx
  File "/usr/lib/python3.9/genericpath.py", line 19, in exists
    os.stat(path)
TypeError: stat: path should be string, bytes, os.PathLike or integer, not NoneType

There is warning for missing local headers that could have helped to pinpoint the problem but it is not shown because the condition triggering the warning crashes on None path (optix/module.pyx:413).

In the "From source" in the section in the README.md it is documented to use setup.py.