+std::ostream& operator<<(std::ostream& o, const ARDOUR::FadeShape& sf);
+std::ostream& operator<<(std::ostream& o, const ARDOUR::RegionSelectionAfterSplit& sf);
+std::ostream& operator<<(std::ostream& o, const ARDOUR::BufferingPreset& var);
+std::ostream& operator<<(std::ostream& o, const ARDOUR::AutoReturnTarget& sf);
+std::ostream& operator<<(std::ostream& o, const ARDOUR::MeterType& sf);
+
+/* because these operators work on types which can be used when making
+ a UI_CONFIG_VARIABLE (in gtk2_ardour) we need them to be exported.
+*/
+LIBARDOUR_API std::istream& operator>>(std::istream& o, ARDOUR::WaveformScale& sf);
+LIBARDOUR_API std::istream& operator>>(std::istream& o, ARDOUR::WaveformShape& sf);
+LIBARDOUR_API std::istream& operator>>(std::istream& o, ARDOUR::VUMeterStandard& sf);
+LIBARDOUR_API std::istream& operator>>(std::istream& o, ARDOUR::MeterLineUp& sf);
+
+LIBARDOUR_API std::ostream& operator<<(std::ostream& o, const ARDOUR::WaveformScale& sf);
+LIBARDOUR_API std::ostream& operator<<(std::ostream& o, const ARDOUR::WaveformShape& sf);
+LIBARDOUR_API std::ostream& operator<<(std::ostream& o, const ARDOUR::VUMeterStandard& sf);
+LIBARDOUR_API std::ostream& operator<<(std::ostream& o, const ARDOUR::MeterLineUp& sf);
+