[Bill Meier <wmeier@xxxxxxxxxxx>]

Seen on gtk-list@xxxxxxxxx

From ebassi@xxxxxxxxx

<snip>

Having said that, I must also warn you: do not try to support GTK+ 2
and GTK+ 3 in the same code base. It was doable back when GTK+ 3 was
new, four years ago, but the code base, requirement, assumptions, and
API have been diverging to the point of being a massive waste of time
— for you, for packagers, for users, and for people answering your
questions.

Either stick with GTK+ 2.24, or port to GTK+ 3.

Ciao,
 Emmanuele.