+#if SIMGRID_VERSION < MAKE_SIMGRID_VERSION(3, 8, 0) // ==== SG < 3.8 === //
+# define MSG_init(argc, argv) MSG_global_init(argc, argv)
+# define msg_error_t MSG_error_t
+# define msg_host_t m_host_t
+# define msg_process_t m_process_t
+# define msg_task_t m_task_t
+#else // =============================================================== //
+# define MSG_clean() MSG_OK
+#endif // ============================================================== //