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-rw-r--r--libs/ardour/audioengine.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index c4f90efd49..8a27755d39 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -40,6 +40,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
jack_nframes_t Port::short_over_length = 2;
jack_nframes_t Port::long_over_length = 10;