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-rw-r--r--gtk2_ardour/ardour_ui.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/gtk2_ardour/ardour_ui.h b/gtk2_ardour/ardour_ui.h
index ace51c79cb..180abfdead 100644
--- a/gtk2_ardour/ardour_ui.h
+++ b/gtk2_ardour/ardour_ui.h
@@ -145,6 +145,10 @@ namespace Gtk {
class ProgressBar;
}
+namespace Gtkmm2ext {
+ class Tabbable;
+}
+
class ARDOUR_UI : public Gtkmm2ext::UI, public ARDOUR::SessionHandlePtr
{
public: