QXcbConnection error at startup

Marc_Van_Daele

When running the following application from QtCreator (4.2.0) using Qt5.7.1

#include <QGuiApplication>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    return app.exec();
}

I get the following error

QML debugging is enabled. Only use this in a safe environment.
QXcbConnection: XCB error: 179 (Unknown), sequence: 174, resource id: 0, major code: 153 (Unknown), minor code: 20

Any idea how to avoid/mask this error?

SGaist

Hi,

What Linux distribution are you running ?
What desktop environnement are you using ?
Did you test your application using your distribution provided Qt ?

Marc_Van_Daele

We are running Debian Wheezy (Yes, I know :-)) , desktop environment xfce4.
I've only tested against Qt5.7.1, not against Qt provided by the distribution (and I would rather not install it since I'm afraid it might break our current setup)

SGaist

The thing is, it's likely already installed just not the développement packages.

Can you check which version it is ?

You X installation might be too old.

Marc_Van_Daele

Next to my /usr/local/Qt5.7.1, I indeed also have

/usr/include/qt4
/usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.6 (and other .so files)

SGaist

What desktop environment are you using ?

Marc_Van_Daele

My desktop environment is xfce4
Obviously this is a very minor issue so don't spend too much of your time on this (although I do appreciate your support!).