build fix

git-svn-id: svn://localhost/ardour2/branches/3.0@7198 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/gtk2_ardour/mixer_ui.h b/gtk2_ardour/mixer_ui.h
index 935e85559e7d2240320295a969ac09ba6847881a..5349ebb36b46b47fe73b0746de4811296ef0bb8a 100644 (file)
--- a/gtk2_ardour/mixer_ui.h
+++ b/gtk2_ardour/mixer_ui.h
@@ -31,6 +31,7 @@
 #include <gtkmm/paned.h>
 #include <gtkmm/menu.h>
 #include <gtkmm/treeview.h>
+#include <gtkmm/liststore.h>
 
 #include "pbd/stateful.h"
 #include "pbd/signals.h"