-extern int _sg_do_model_check; /* please don't use directly: we inline MC_is_active, but that's what you should use */
-extern int _sg_mc_visited;
+/* Internal variable used to check if we're running under the MC
+ *
+ * Please don't use directly: you should use MC_is_active. */
+extern XBT_PUBLIC(int) _sg_do_model_check;
+extern XBT_PUBLIC(int) _sg_mc_max_visited_states;