PySide6 build and installl from source is broken

I was following the docs here and encountered few problmes.
1. preforming `python setup.py build --qtpaths=/opt/Qt/6.0.0/gcc_64/bin/qtpaths --build-tests --ignore-git --parallel=8` requires root privileges, without it it wouldn't build successfully on my platform.

2. preforming `python setup.py install --qtpaths=/opt/Qt/6.0.0/gcc_64/bin/qtpaths --build-tests --ignore-git --parallel=8` raises error(traceback in attached files)