- static void add_spacing_unit (Score_element*me, Item*);
- static void set_interface (Score_element*);
- static SCM set_spacing_rods (SCM);
+ static void add_spacing_unit (Grob *me, Item *);
+
+ DECLARE_GROB_INTERFACE();
+ DECLARE_SCHEME_CALLBACK (set_spacing_rods, (SCM));