When building the 2.24 branch in jhbuild today, git master as of commit 5350edbb2ce4ac7b6d7e05ab0914ae21c28c58d0.

Stuff like:

gtkcalendar.c: In function ‘calendar_paint_arrow’:
gtkcalendar.c:2735: warning: implicit declaration of function ‘gdk_drawable_get_size’

gtkcombobox.c: In function ‘popup_grab_on_window’:
gtkcombobox.c:1878: warning: implicit declaration of function ‘gdk_drawable_get_display’
gtkcombobox.c:1879: warning: passing argument 1 of ‘gdk_display_pointer_ungrab’ makes pointer from integer without a cast
../gdk/gdkdisplay.h:150: note: expected ‘struct GdkDisplay *’ but argument is of type ‘int’

gtkentry.c: In function ‘gtk_entry_get_text_area_size’:
gtkentry.c:3003: warning: implicit declaration of function ‘gdk_drawable_get_size’
gtkentry.c: In function ‘set_invisible_cursor’:
gtkentry.c:4070: warning: implicit declaration of function ‘gdk_drawable_get_display’
gtkentry.c:4070: warning: assignment makes pointer from integer without a cast


etc.