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Problems with libqxcb



  • I have been having some problems with libqxcb.so

    If I run "ldd" on "/opt/Qt5/plugins/platforms/libqxcb.so", "libQt5XcbQpa.so.5" is reported as not being found.

    Even though "libQt5XcbQpa.so.5" can be found in "/opt/Qt5/lib/libQt5XcbQpa.so.5"

    ldd /opt/Qt5/lib/libQt5XcbQpa.so.5
    libQt5Gui.so.5 => not found
    libQt5DBus.so.5 => not found
    libQt5Core.so.5 => not found

    ldd /opt/Qt5/lib/libQt5DBus.so.5
    libQt5Core.so.5 => not found

    ldd /opt/Qt5/lib/libQt5Gui.so.5
    libQt5Core.so.5 => not found

    ldd /opt/Qt5/lib/libQt5Core.so.5
    [nothing is missing]

    ldd /opt/Qt5/lib/libQt5Gui.so.5
    [nothing is missing]


  • Lifetime Qt Champion

    Hi and welcome to devnet,

    How did you install Qt ?
    Which version is it ?



  • I'm using Qt5.15.2, compiled from source. I eventually figured out the problem. It just needed export paths for "LD_LIBRARY_PATH" and "QT_PLUGIN_PATH", then it worked Ok.

    export LD_LIBRARY_PATH=/opt/Qt5/lib
    export QT_PLUGIN_PATH=/opt/Qt5/plugins


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