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-rw-r--r--libs/gtkmm2ext/gtk_ui.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/gtkmm2ext/gtk_ui.cc b/libs/gtkmm2ext/gtk_ui.cc
index 50d6114dee..55a6bebb02 100644
--- a/libs/gtkmm2ext/gtk_ui.cc
+++ b/libs/gtkmm2ext/gtk_ui.cc
@@ -43,6 +43,7 @@
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace Glib;
+using namespace PBD;
using std::map;
pthread_t UI::gui_thread;