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-rw-r--r--libs/ardour/mtdm.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/libs/ardour/mtdm.cc b/libs/ardour/mtdm.cc
index dceb4f8406..ba73025053 100644
--- a/libs/ardour/mtdm.cc
+++ b/libs/ardour/mtdm.cc
@@ -16,6 +16,8 @@
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <math.h>
+
#include "ardour/mtdm.h"
MTDM::MTDM (void)