Compiling git master on ubuntu trusty fails:

  VALAC    vte_2_91_vala.stamp
app.vala:360.42-360.46: error: Argument 1: Cannot convert from `Gdk.EventButton' to `Gdk.Event'
		var match = terminal.match_check_event(event, null);
		                                       ^^^^^
Compilation failed: 1 error(s), 0 warning(s)

I assume it works on your system ChPe, so it must be a change in Gtk or whatever, not sure in which direction.

(Commenting out the "var match = ..." and the subsequent statement relying on "match" makes it compile, so this is the only error.)