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-rw-r--r--gtk2_ardour/audio_clock.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/audio_clock.cc b/gtk2_ardour/audio_clock.cc
index ae170b8548..15fd85c229 100644
--- a/gtk2_ardour/audio_clock.cc
+++ b/gtk2_ardour/audio_clock.cc
@@ -31,6 +31,7 @@
#include "gtkmm2ext/rgb_macros.h"
#include "ardour/profile.h"
+#include "ardour/lmath.h"
#include "ardour/session.h"
#include "ardour/slave.h"
#include "ardour/tempo.h"