I follow the instructions of "README.debian" in Debian bookworm. Launching "fakeroot debian/rules binary" at the end of the process the following errors appear:
dh_clean: error: Compatibility levels before 7 are no longer supported (level 5 requested)
dh_clean: error: Compatibility levels before 7 are no longer supported (level 5 requested)
make: *** [debian/rules:85: install-arch] Errore 255
The error no longer appears when building the deb package with the latest GTKG 1.2.3 version!