static void add_grob (Grob *, SCM nm, SCM x);
static void add_unordered_grob (Grob *, SCM nm, Grob *);
static void set_ordered (Grob *, SCM, bool);
static void add_grob (Grob *, SCM nm, SCM x);
static void add_unordered_grob (Grob *, SCM nm, Grob *);
static void set_ordered (Grob *, SCM, bool);