I've done this by #defining the old names in terms of the new ones,
because the old ones are still more concise!
#endif
#if GTK_CHECK_VERSION(3,0,0)
#endif
#if GTK_CHECK_VERSION(3,0,0)
+/* The old names are still more concise! */
+#define gtk_hbox_new(x,y) gtk_box_new(GTK_ORIENTATION_HORIZONTAL,y)
+#define gtk_vbox_new(x,y) gtk_box_new(GTK_ORIENTATION_VERTICAL,y)
/* GTK 3 has retired stock button labels */
#define LABEL_OK "_OK"
#define LABEL_CANCEL "_Cancel"
/* GTK 3 has retired stock button labels */
#define LABEL_OK "_OK"
#define LABEL_CANCEL "_Cancel"