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-rw-r--r--mate-panel/panel.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mate-panel/panel.c b/mate-panel/panel.c
index 15719418..8ac44a88 100644
--- a/mate-panel/panel.c
+++ b/mate-panel/panel.c
@@ -20,6 +20,7 @@
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#if GTK_CHECK_VERSION (3, 0, 0)
+#include <gtk/gtkx.h> /* for GTK_IS_SOCKET */
#include <gdk/gdkkeysyms-compat.h>
#endif