It isn't a limitation of the OS, or of Emacs really. There is a build where you can embed GTK widgets inside of Emacs. It just isn't at all standard or, last I

It isn't a limitation of the OS, or of Emacs really. There is a build where you can embed GTK widgets inside of Emacs. It just isn't at all standard or, last I checked, well supported (on the level that the usual Emacs distribution is).