opengl and gtk

["andy gill" <andyggill gmail com>]

is there any officially supported way of integrating opengl into a
gtk/gtkmm/gtk# application? the gtkglarea and gtkglext extensions seem
to have varying levels of support for different platforms/language
bindings, and i don't quite understand why there isn't opengl support
in the main tree.
what's the best (i.e. documented and supported) way of getting opengl and gtk to work together?

cheers.