For resources that are shipped by the CGAL_Qt4 library, one need to call
CGAL_QT4_INIT_RESOURCES, a macro that calls CGAL_Qt4_init_resources
(exported by the CGAL_Qt4 DLL)
That allows to build libCGAL_Qt4 and the Polyhedron demo with
-fvisibility-ms-compat on Linux.
That may allow to build CGAL_Qt4 as a DLL on Windows, one day.