[GtkGLExt] windows linking errors

["Sven Rech" <svenrech gmx de>]

After hours of trying, I finally got gtkglextmm compiled and installed under windows using mingw.

But there is a problem with the "DrawingArea" class. Every example that uses this widget (my own project uses this class too), shows an error message similar to this:

g++ -o openanno-editor gtkgui.o mapwidget.o main.o `pkg-config --libs gtkmm-2.4 libglademm-2.4 gtkglextmm-1.2`
Info: resolving vtable for Gtk::GL::DrawingAreaby linking to __imp___ZTVN3Gtk2GL11DrawingAreaE (auto-import)
mapwidget.o(.text$_ZN3Gtk2GL11DrawingAreaC2Ev[Gtk::GL::DrawingArea::DrawingArea()]+0x99):mapwidget.cpp: variable 'vtable for Gtk::GL::DrawingArea' can't be auto-imported. Please read the documentation for ld's --enable-auto-import for details.
collect2: ld returned 1 exit status
make: *** [all] Error 1

This problem only occurs using the DrawingArea widget.
Under linux, it works just fine.

I hope anybody can help me :(
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