there are standard packages on buster that are newer versions of these libraries. binary python-cec should not be embedded in this repo. Note python-lirc is current but this is not maintained.
cat requirements.txt
python-lirc==1.2.3
paho-mqtt==1.3.1
apt list python3-paho-mqtt python3-cec
Listing... Done
python3-cec/oldstable,now 6.0.2-2+rpt2 armhf [installed]
python3-paho-mqtt/oldstable,now 1.5.1-1 all [installed]
there are standard packages on buster that are newer versions of these libraries. binary python-cec should not be embedded in this repo. Note python-lirc is current but this is not maintained.