+extern const std::string engine_info(bool to_uci = false);
+extern void timed_wait(WaitCondition&, Lock&, int);
+extern void prefetch(char* addr);
+extern void start_logger(bool b);
+
+extern void dbg_hit_on(bool b);
+extern void dbg_hit_on_c(bool c, bool b);
+extern void dbg_mean_of(int v);
+extern void dbg_print();