i need qcad to run under "optirun" command (Linux Mint 19 with "BumbleBee") so it uses my NVIDIA GFX card instead of the built-in, slow INTEL GFX card. I tried to start qcad like this but without success:
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export QT_AUTO_SCREEN_SCALE_FACTOR=1 LD_LIBRARY_PATH=/home/user/opt/qcadcam-3.25.0-pro-linux-qt5.14-x86_64/
optirun ./qcad-bin
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CAD version 3.25.0
14:52:37: Info: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Fatal: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.
cheers....