Print settings Qt5 applications


I am unable to print from Qt5 applications (Qpdfview, Qupzilla), there is no "lp" option in the print dialogs. The printer is a Dell PS network laserprinter and works fine with lpd and a simple printcap file. The Qt5 applications are the only ones that have no printer in the print dialog boxes.

Does anyone know where Qt5 applications get their print settings? I would like to point them to my lp.

Thanks and regards,