Gtk 3.20 dep is optional
https://git.gnome.org/browse/gitg/commit/?id=3aa366423109d50b397e26bdfd2873713817880a
Gtk 3.20 dep is optional
https:/ /git.gnome. org/browse/ gitg/commit/ ?id=3aa36642310 9d50b397e26bdfd 2873713817880a