linux - Missing library starting up QT5 -


i have qt application trying run, fails start because "could not find or load qt platform plugin "xcb". when run ldd on libqxcb.so libraries linked except one: libxcb-icccm.so.1 => not found

now, have libxcb-icccm.so.4 on machine, if create symlink pointing it, crashes , burns. i've found icccm library comes xorg libs, when download source build it, have far ended libxcb-icccm.so.4 instead of libxcb-icccm.so.1

am doing wrong, or missing version of xcb libraries need build libxcb-icccm.so.1

this version of icccm library can found in: xcb-util-0.3.6


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