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-rw-r--r--libs/ardour/audio_library.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/audio_library.cc b/libs/ardour/audio_library.cc
index bf462f7128..7f421e86c8 100644
--- a/libs/ardour/audio_library.cc
+++ b/libs/ardour/audio_library.cc
@@ -42,6 +42,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
static char* SOUNDFILE = "http://ardour.org/ontology/Soundfile";