There are no binary builds for the ARM architecture of the Pi and you need to install some Qt5 related packages. This post documents how I got things running on standard Raspberry Pi OS on a Raspberry Pi 400.
git clone https://github.com/MasterQ32/kristall.git cd kristall sudo apt-get install qt5-default qtmultimedia5-dev libqt5svg5-dev make ./kristall
Beyond this point you could copy
/usr/local/bin or wherever you want to run it from, as well as install the desktop file to get things into the application menu:
sudo mv kristall /usr/local/bin/ cp Kristall.desktop ~/.local/share/applications/kristall.desktop update-desktop-database ~/.local/share/applications