[vtkusers] Undefined reference to vitual table (linker error)

[stefano perticoni]

Could you explain me this error message ?

/home/spertico/multimod/MMTrash/mmGTK/bin/libmafService.a(mafVisualizationArea.o): 
In function `mafVisualizationArea::mafVisualizationArea(wxWindow *, int)':
/home/spertico/multimod/MMTrash/mmGTK/lal/Service/mafVisualizationArea.cpp:23: 

undefined reference to `mafVisualizationArea virtual table'
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This is from an application built on top of vtk and wxGTK. The same 
application is
working under Windows (wxWindows instead of wxGTK).

Regards,
Stefano