diff --git a/libs/ardour/bbt_time.cc b/libs/ardour/bbt_time.cc
new file mode 100644
index 0000000000..a6e27d061f
--- /dev/null
+++ b/libs/ardour/bbt_time.cc
@@ -0,0 +1,36 @@
+/*
+    Copyright (C) 2009 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "ardour/bbt_time.h"
+#include "ardour/tempo.h"
+
+using namespace ARDOUR;
+
+bool
+BBT_Time::add (BBT_Time& target, const BBT_Time& other, const TempoMetric& metric)
+{
+	return true;
+}
+
+bool
+BBT_Time::subtract (BBT_Time& target, const BBT_Time& other, const TempoMetric& metric)
+{
+	return true;
+}
+