gstreamermm Gst::ElementInterfaced and Gst::XOverlay cannot be resolved

[pjsanfil]

Hi,

Using gstreamermm-1.0 I am trying to set a DrawingArea to place video
frames in. Using the following code to try and set the XID for where to
place the frames:
        Glib::RefPtr<Gst::Element> element =
Glib::RefPtr<Gst::Element>::cast_dynamic(msg->get_source());
        Glib::RefPtr< Gst::ElementInterfaced<Gst::XOverlay> > xoverlay =
        Gst::Interface::cast <Gst::XOverlay>(element);

I get compiler errors saying ElementInterfaced is not a member of Gst   and
XOverlay is not a member of Gst.

When I search through my header files for XOverlay I do not see it defined
anywhere. The instructions for the Gst::VideoOverlay class say to set the
XID this way.

Thanks,
Paul
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