gtk-demo and "foreigndrawing"

Hans L via gtkmm-list <[email protected]>
Newsgroups gmane.comp.gnome.gtkmm
Message-ID <CAFoRp-OKAvEeBC17PA=a-1ycYzC6Ch7CBWjknjSjBbFnQJ23dg@mail.gmail.com> 
I've attempted to build gtkmm (3.22.3)  from source on Linux Mint 19,
but the Makefile under demos says there's "nothing to do for 'all' "

I'm mainly interested to see an example analogous to the
"foreigndrawing.c" code from GTK source here:
https://gitlab.gnome.org/GNOME/gtk/blob/3.22.30/demos/gtk-demo/foreigndrawing.c

But it seems that this is not included in the gtkmm demo code anyways.
I can find no mention of "foreign" at all in the source tree.

Does the gtkmm/demos/gtk-demo code really build / function or is it unfinished?
Any help would be appreciated.

- Hans Loeblich
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