tce-load -i compiletc python3.9-dev

wget https://files.pythonhosted.org/packages/21/ed/f86a79a07470cb07819390452f178b3bef1d375f2ec021ecfc709fc7cf07/idna-3.7.tar.gz

cd idna-3.7

python3.9 setup.py build
sudo python3.9 setup.py install --root=/tmp/pkg

no setup.py so..
sudo pip install idna