Mine

+#ifdef USE_LEVENT
+	//show version of libevent at start
+	sLog.outBasic("Using %s version of LibEvent",event_get_version());
+	bool isvalid_vlibevent=false;
+	const char* accepted_vlibevent[]=REQ_LEVENT_VER;
+	for(int i=0;accepted_vlibevent[i];i++)
+		if(!strcmp(event_get_version(),accepted_vlibevent[i]))
+		{
+			isvalid_vlibevent=true;
+			break;
+		}
+		if(!isvalid_vlibevent)
+		{
+			sLog.outError("Version of libevent is wrong, shutdown now");
+		return 1;
+		}
+#endif//USE_LEVENT