-std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
-std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
-std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
+LIBARDOUR_API std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
+LIBARDOUR_API std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
+LIBARDOUR_API std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);