static Molecule flag (Grob*);
DECLARE_SCHEME_CALLBACK(before_line_breaking, (SCM ));
DECLARE_SCHEME_CALLBACK(dim_callback, (SCM smob, SCM axis));
+ DECLARE_SCHEME_CALLBACK (height, (SCM,SCM));
static bool has_interface (Grob*);
static void set_interface (Grob*);