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-rw-r--r--lily/include/lily-proto.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/lily/include/lily-proto.hh b/lily/include/lily-proto.hh
index ff9e0fea4f..abe556db86 100644
--- a/lily/include/lily-proto.hh
+++ b/lily/include/lily-proto.hh
@@ -52,5 +52,9 @@ struct Stem_req;
struct Terminate_voice_req;
struct Text_req;
struct Timing_req;
+struct Note_column_register;
+struct Note_column;
+struct Staff_side;
+struct Staff_symbol;
#endif // LILY_PROTO_HH