Saku,

QT5 is obsolete, see below. I think that you should remove support for it from Cqrlog-Improved rather than trying to support a dead system.

Qt 5 is officially obsolete and reached its End of Life (EOL) for standard support in May 2023. The current standard is Qt 6, which offers vastly improved rendering performance, modern graphics pipeline support (Vulkan, Metal), and better cross-platform capabilities

Standard support for Qt 5.15 LTS (the final Qt 5 version) concluded. Public updates, bug fixes, and security patches are no longer provided by The Qt Company unless you purchase expensive Extended Support.

Colin