How to install asammdf without c-extensions?

[PrathameshNimkar]

I am trying to install the asammdf python package without c-extensions on py3.8 on macos using pip.
I tried to install using the following:

pip uninstall asammdf
pip cache purge
pip install asammdf --no-binary :all:

And when I checked the site packages, I still found blocks/cutils.c.
This is used as a dependency in mdf_v4.py and mdf_v4.py and so on.
Looking for advice on how to get rid of all c-extensions and have no .c files.
Essentially I'm looking for a pure python package to use with mf4 files.

[danielhrisca]

The C extension is mandatory