static SCM aligned_on_parent (Grob *me, Axis a);
static void set_center_parent (Grob *me, Axis a);
static void set_align_self (Grob *me, Axis a);
static SCM aligned_on_parent (Grob *me, Axis a);
static void set_center_parent (Grob *me, Axis a);
static void set_align_self (Grob *me, Axis a);