Package: qtchooser Version: 63-g13a3d08-1 Severity: important User: helmutg@debian.org Usertags: rebootstrap $ sudo apt-get install qt5-qmake ... $ qmake -qtconf foo qmake: could not find a Qt installation of 'conf' $ That's wrong. qtchooser needs to pass -qtconf down to the actual qmake rather than interpreting it itself. Helmut