They seemed to have gone back for compatibility’s sake, hopefully they don't change it again
#include "draw.h"
#ifdef OSXAPP
-# include <gtkmacintegration-gtk2/gtkosxapplication.h>
+# include <gtkmacintegration/gtkosxapplication.h>
// prevent pathname of positional file argument provided by OS X being be mistaken for option name
// (price is that we won't recognize Windows option format anymore).
# define SLASH '-'
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#ifdef OSXAPP
-# include <gtkmacintegration-gtk2/gtkosxapplication.h>
+# include <gtkmacintegration/gtkosxapplication.h>
#endif
#include "common.h"