typedef struct lmm_element *lmm_element_t;
typedef struct lmm_variable *lmm_variable_t;
typedef struct lmm_constraint *lmm_constraint_t;
+typedef struct lmm_constraint_light *lmm_constraint_light_t;
typedef struct lmm_system *lmm_system_t;
typedef struct tmgr_history *tmgr_history_t;