1 files changed, 4 insertions, 1 deletions
diff --git a/libs/canvas/canvas/line_set.h b/libs/canvas/canvas/line_set.h
index cd551438b1..a9b13651d9 100644
--- a/libs/canvas/canvas/line_set.h
+++ b/libs/canvas/canvas/line_set.h
@@ -17,11 +17,12 @@
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "canvas/visibility.h"
 #include "canvas/item.h"
 
 namespace ArdourCanvas {
 
-class LineSet : public Item
+class LIBCANVAS_API LineSet : public Item
 {
 public:
 	enum Orientation {
@@ -34,6 +35,8 @@ public:
 	void compute_bounding_box () const;
 	void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
 
+        bool covers (Duple const &) const;
+
 	void set_height (Distance);
 
 	void add (Coord, Distance, Color);