include Tracks engine state controller header for Tracks build

diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 2647e5cd38a0f834cfc910a32a6900aa0e55e459..e6e6f5f17aad44ab4fb4de8506ec60995a1d2316 100644 (file)
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -67,6 +67,9 @@
 #include "ardour/data_type.h"
 #include "ardour/debug.h"
 #include "ardour/directory_names.h"
+#ifdef USE_TRACKS_CODE_FEATURES
+#include "ardour/engine_state_controller.h"
+#endif
 #include "ardour/filename_extensions.h"
 #include "ardour/graph.h"
 #include "ardour/midiport_manager.h"