[virtualbox@localhost XnView]$ QT_DEBUG_PLUGINS=1 QT_QPA_PLATFORM="wayland" ./xnview.sh
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
QFactoryLoader::QFactoryLoader() checking directory path "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqlinuxfb.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archreq": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqminimal.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqminimalegl.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archreq": 0,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqoffscreen.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqvnc.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archreq": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-egl.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("wayland-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-generic.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-generic.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland"
        ]
    },
    "archreq": 0,
    "className": "QWaylandIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("wayland")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-xcomposite-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("wayland-xcomposite-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-xcomposite-glx.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-glx"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeGlxPlatformIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("wayland-xcomposite-glx")
QFactoryLoader::QFactoryLoader() looking at "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqxcb.so"
Found metadata in lib /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/platforms" ...
Cannot load library /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-generic.so: (/lib64/libQt5WaylandClient.so.5: version `Qt_5_PRIVATE_API' not found (required by /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-generic.so))
QLibraryPrivate::loadPlugin failed on "/home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-generic.so" : "Cannot load library /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-generic.so: (/lib64/libQt5WaylandClient.so.5: version `Qt_5_PRIVATE_API' not found (required by /home/virtualbox/Downloads/XnViewMP-linux-x64/XnView/lib/platforms/libqwayland-generic.so))"
qt.qpa.plugin: Could not load the Qt platform plugin "wayland" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

Aborted (core dumped)