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this is all very distro dependant, if i may say, and very qt5 specific too :/

if both qt5 and qt4 are installed on your system and the default is qt5, then i'd suggest you to try

or

in either case, if qt5 is not the system selected default, then maybe you'll need something like this:

let me remind you that qtractor is currently recommended for packaging as a qt4 only application;

building it as a qt5 one, although perfectly functional and operational, it will end as an utterly crippled audio/MIDI application on some rather important features, mostly on the LV2 plugin GUI support

that said, only the lv2_external_ui (unofficial) extension is then supported; there will be NO libSUIL wrapped amenities whatsoever, that meaning that most if not all native GTK+, X11 or even Qt4 plugin GUIs will be ditched out or completely forbidden--some will even crash on show.

hth.
cheers