typedef struct s_lmm_element_t* lmm_element_t;
typedef struct s_lmm_variable_t* lmm_variable_t;
typedef struct s_lmm_constraint_t* lmm_constraint_t;
typedef struct s_lmm_constraint_light_t* lmm_constraint_light_t;
typedef struct s_lmm_system_t* lmm_system_t;
typedef struct s_lmm_element_t* lmm_element_t;
typedef struct s_lmm_variable_t* lmm_variable_t;
typedef struct s_lmm_constraint_t* lmm_constraint_t;
typedef struct s_lmm_constraint_light_t* lmm_constraint_light_t;
typedef struct s_lmm_system_t* lmm_system_t;