Prerequisite steps for Debian Sid users

sudo apt-get update
sudo apt-get install cmake cython3 libeigen3-dev libepoxy-dev libfontconfig1-dev libfreetype6-dev libharfbuzz-dev libogg-dev libopus-dev libopusfile-dev libpng-dev libsdl2-dev libsdl2-image-dev python3-dev python3-jinja2 python3-numpy python3-pil python3-pip python3-pygments qml-module-qtquick-controls qtdeclarative5-dev

You will also need nyan and its dependencies.