Add wl_subcompositor support
diff --git a/src/wl_platform.h b/src/wl_platform.h
index 44f6f2d..d62ff91 100644
--- a/src/wl_platform.h
+++ b/src/wl_platform.h
@@ -192,6 +192,7 @@
     struct wl_display*          display;
     struct wl_registry*         registry;
     struct wl_compositor*       compositor;
+    struct wl_subcompositor*    subcompositor;
     struct wl_shell*            shell;
     struct wl_shm*              shm;
     struct wl_seat*             seat;