libQt 4.5.1 Undefined symbol _ZTI18QTransformedScreen

[tonys]

I have a dl I am loading that contains the following code:

QScreen* qscreen = QScreen::instance();
      QTransformedScreen* screen = dynamic_cast<QTransformedScreen*>( qscreen );

QScreen* qscreen = QScreen::instance();
      QTransformedScreen* screen = dynamic_cast<QTransformedScreen*>( qscreen );

To copy to clipboard, switch view to plain text mode 

On loading I get the following error:

undefined symbol: _ZTI18QTransformedScreen

undefined symbol: _ZTI18QTransformedScreen

To copy to clipboard, switch view to plain text mode 

which according to c++ filt is

typeinfo for QTransformedScreen

typeinfo for QTransformedScreen

To copy to clipboard, switch view to plain text mode 

.

The results of

nm libQtGui.so.4.5.1

nm libQtGui.so.4.5.1

To copy to clipboard, switch view to plain text mode 

contain

009a85dc d _ZTI18QTransformedScreen
007da100 r _ZTS18QTransformedScreen
009a8520 d _ZTV18QTransformedScreen

009a85dc d _ZTI18QTransformedScreen
007da100 r _ZTS18QTransformedScreen
009a8520 d _ZTV18QTransformedScreen

To copy to clipboard, switch view to plain text mode 

Anyone have an idea what could cause this problem?