slackbuilds_ponce/python/python3-setuptools-rust-opt

python3-setuptools-rust-opt (setuptools-rust installed to /opt)

setuptools-rust is a plugin for setuptools to build Rust Python
extensions implemented with PyO3 or rust-cpython.

Installs to /opt/python3.9/site-packages

Add the following before the python3 build commands in your
Slackbuild to use this version over the stock one in 15.0:

export PYTHONPATH=/opt/python3.9/site-packages/