Trying to follow the SeL4 compilation and testing instruction “as-is” yields some errors on a per-distribution basis. Below are some notes for Fedora 37 – if you have not performed these steps, you are likely to run into errors (it is assumed that repo/ninja/cmake are already installed 🙂 )
sudo dnf install -y python3-protobuf protobuf-compiler
pip install future
Then try again the provided steps and you should be good to go …