Qt QGuiApplication or QApplication results in "No NSMainNibFile .."

I am creating an application extension for OSX 10.10 using Qt libraries.

Ultimately I need to create an instance QApplication

to create QWidget

-derived classes . The software behaves as expected if built with:

int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);
    NSLog(CFSTR("Invoking Main"));
    __asm__ ("call _NSExtensionMain");
}

      

        
        
        
      

    

Build it with

int main(int argc, char *argv[]) {
    QGuiApplication a(argc, argv);
    NSLog(CFSTR("Invoking Main"));
    __asm__ ("call _NSExtensionMain");
}

      

        
        
        
      

    

Throws the following error at runtime:

24/10/2014 14:40:08.091 My_ShellExt[32427]: Invoking Main  
24/10/2014 14:40:08.092 My_ShellExt[32427]: No NSMainNibFile or NSMainStoryboardFile specified in info dictionary, exiting
24/10/2014 14:40:08.095 com.apple.xpc.launchd[1]: (me.qdot.My_Daemon.My_ShellExt[32427]) Service exited with abnormal code: 1