1 files changed, 8 insertions, 0 deletions
diff --git a/demos/gtk-demo/graphwidget.h b/demos/gtk-demo/graphwidget.h
new file mode 100644
index 0000000000..5df372f704
--- /dev/null
+++ b/demos/gtk-demo/graphwidget.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define GRAPH_TYPE_WIDGET (graph_widget_get_type ())
+G_DECLARE_FINAL_TYPE (GraphWidget, graph_widget, GRAPH, WIDGET, GtkWidget)
+
+GtkWidget * graph_widget_new       (void);