If you want to work on this repository, the standard recipe is shown below, with flit being used for the editable install, because adding a unified interface for editable installs to PEP 517 is still an open topic.

python3 -m venv venv
. venv/bin/activate
pip install flit
flit install --symlink

Other than this, using pip and python-build should work as expected, though flit does also have a nice command line interface.