[gtkmm] [gtkglmm] Cannot set pixel format for a Gdk::GL::Pixmap?

["Drinkin Park" <drink_n_park hotmail com>]

Hi all,

I recently restarted the development of an OpenGL-enabled gtkmm application 
of mine on my upgraded computer; however, I cannot run the application due 
to the following errors:

GdkGLExt-WARNING **: cannot set pixel format
GdkGLExt-WARNING **: cannotcreate GdkGLPixmap

these error messages occur upon calling the following function from the 
configure method of a Gtk::GL::DrawingArea:

//DrawingArea.h
class MyDrawingArea : public Gtk::GL::DrawingArea
{
Glib::RefPtr<Gdk::GL::Pixmap>  GLbuffer;
Glib::RefPtr<Gdk::GL::Config>  GLconfig;
Glib::RefPtr<Gdk::Pixmap> buffer;
};


bool MyDrawingArea ::configure(GdkEventConfigure* event)
{
...
GLbuffer = Gdk::GL::Pixmap::set_gl_capability(buffer, GLconfig); //it is 
this line that causes the error.
...
}

Needless to say, it was working before. (Isn't that always the way for 
novice programmers?) Also, the example applications provided with the 
gtkglextmm packages work properly.

Of course, any help will be appreciated.

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