I'm using ubuntu-11.04,
My application works good with shared version of Qt libs.
But there is a damn problem with statically linked version of Qt, indeed it compiles and links successfully but it can't run!!
I also test 'qmusicplayer' from Qt's example folder, message are similar with static version of Qt-4.6.2 and Qt-4.8.2:
Qt Code: 
  1. srazi@SRazi-Linux:~/qmusicplayer$ ./qmusicplayer 
  2. WARNING: Phonon needs QCoreApplication::applicationName to be set to export audio output names through the DBUS interface 
  3. ASSERT: "QCoreApplication::instance()" in file ../../phonon/factory.cpp, line 378
  4. Aborted
  5. srazi@SRazi-Linux:~/qmusicplayer$
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Please see the line 359:
Qt Code: 
  1. // ../../phonon/factory.cpp
  2. /* line 354 */ #ifndef QT_NO_DBUS
  3.     if (!QCoreApplication::instance() || QCoreApplication::applicationName().isEmpty()) {
  4.         pWarning() << "Phonon needs QCoreApplication::applicationName to be set to export audio output names through the DBUS interface";
  5.     }
  6. #endif
  7. /* line 359 */    Q_ASSERT(QCoreApplication::instance());
  8.     const QByteArray platform_plugin_env = qgetenv("PHONON_PLATFORMPLUGIN");
  9.     if (!platform_plugin_env.isEmpty()) {
  10.         QPluginLoader pluginLoader(QString::fromLocal8Bit(platform_plugin_env.constData()));
  11.         if (pluginLoader.load()) {
  12.             m_platformPlugin = qobject_cast<PlatformPlugin *>(pluginLoader.instance());
  13.             if (m_platformPlugin) {
  14.                 return m_platformPlugin;
  15.             }
  16.         }
  17.     }
  18.     const QString suffix(QLatin1String("/phonon_platform/"));
  19.     ensureLibraryPathSet();
  20.     QDir dir;
  21.     dir.setNameFilters(
  22.             !qgetenv("KDE_FULL_SESSION").isEmpty() ? QStringList(QLatin1String("kde.*")) :
  23.             (!qgetenv("GNOME_DESKTOP_SESSION_ID").isEmpty() ? QStringList(QLatin1String("gnome.*")) :
  25.             );
  26.  /* line 378 */   dir.setFilter(QDir::Files);
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what's going wrong here? Why (and how?!!!!!!!!!!) 'QCoreApplication::instance()' at line 359 return NULL?