“Failed to load platform plugin “xcb” ” while launching qt5 app on linux without qt installed

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Use ldd (man ldd) to show shared library dependencies. Running this on libqxcb.so 

.../platforms$ ldd libqxcb.so

shows that xcb depends on libQt5DBus.so.5 in addition to libQt5Core.so.5 and libQt5Gui.so.5 (and many other system libs). Add libQt5DBus.so.5 to your collection of shared libs and you should be ready to move on.

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