Talking to myself here... Found and fixed. The error is that one of the many make files that rebuilds the IDE [$(MAKE) -C ide idepkg], this one checks for existence of /usr/share/lazarus/2.2.2/units/x86_64-linux/qt5/, but it's not there. Once created, the scripts all run to completion, and correctly create all compiled units and bin file to the localized ~/.lazarus/*
Until the script is fixed, create the missing dir: sudo mkdir /usr/share/lazarus/<version-n>/units/x86_64-linux/qt5