@lelouedec
The difference between 1.4x and 1.5 later for cpp extension is that we changed the default build using ninja. Can you verify whether you have ninja installed?
If not, you can do one of the following 2:

USE_NINJA=0 python setup.py install
cmdclass={‘build_ext’: BuildExtension.with_options(use_ninja=False)})

Let me know if this works.