# Note: depends on pkg-config
# Note: depends on libffi
# Note: depends on Python
# Note: depends on setuptools
wget -c https://github.com/twisted/constantly/archive/15.1.0/constantly-15.1.0.tar.gz
tar -xzf constantly-15.1.0.tar.gz
cd constantly-15.1.0
python3 setup.py build
python3 setup.py install # as root