+XBT_PUBLIC(void) MC_automaton_new_propositional_symbol(const char* id, void* fct);
+XBT_PUBLIC(void *) MC_snapshot(void);
+XBT_PUBLIC(int) MC_compare_snapshots(void *s1, void *s2);
+
+#else
+
+#define MC_assert(a) xbt_assert(a)
+#define MC_is_active() 0
+
+#endif
+
+