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-rw-r--r--libs/gtkmm2ext/utils.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/gtkmm2ext/utils.cc b/libs/gtkmm2ext/utils.cc
index c10497a8fb..147256b426 100644
--- a/libs/gtkmm2ext/utils.cc
+++ b/libs/gtkmm2ext/utils.cc
@@ -20,6 +20,7 @@
#include <map>
#include <algorithm>
+#include <iostream>
#include <gtk/gtkpaned.h>
#include <gtk/gtk.h>