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-rw-r--r--libs/midi++2/fd_midiport.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/midi++2/fd_midiport.cc b/libs/midi++2/fd_midiport.cc
index 2ced63c259..1d21642a00 100644
--- a/libs/midi++2/fd_midiport.cc
+++ b/libs/midi++2/fd_midiport.cc
@@ -29,6 +29,7 @@
using namespace std;
using namespace MIDI;
+using namespace PBD;
string *FD_MidiPort::midi_dirpath = 0;
string *FD_MidiPort::midi_filename_pattern = 0;