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diff --git a/src/gplot/gplot-internal.h b/src/gplot/gplot-internal.h
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+/*
+ * gplot-internal.h
+ *
+ * Authors:
+ *  Marc Lorber <lorber.marc@wanadoo.fr>
+ * 
+ * Web page: https://github.com/marc-lorber/oregano
+ *
+ * Copyright (C) 1999-2001  Richard Hult
+ * Copyright (C) 2003,2006  Ricardo Markiewicz
+ * Copyright (C) 2009-2012  Marc Lorber
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _GPLOT_INTERNAL_H_
+#define _GPLOT_INTERNAL_H_
+
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+#include <glib.h>
+
+#include "gplot.h"
+#include "gplotfunction.h"
+
+// Internal definitions associated to gplot.h
+
+typedef struct _GPlotClass GPlotClass;
+typedef struct _GPlotPriv GPlotPriv;
+
+
+struct _GPlot {
+	GtkLayout parent;
+
+	GPlotPriv *priv;
+};
+struct _GPlotClass {
+	GtkLayoutClass parent_class;
+};
+
+
+// Internal definitions associated to gplotfunction.h
+
+#define TYPE_GPLOT_FUNCTION            (g_plot_function_get_type ())
+#define GPLOT_FUNCTION_CLASS(klass)     G_TYPE_CHECK_CLASS_CAST (klass, TYPE_GPLOT_FUNCTION, GPlotFunctionClass)
+#define GPLOT_FUNCTION_GET_CLASS(inst) (G_TYPE_INSTANCE_GET_INTERFACE ((inst), TYPE_GPLOT_FUNCTION, GPlotFunctionClass))
+
+typedef struct _GPlotFunctionClass GPlotFunctionClass;
+
+struct _GPlotFunctionClass {
+	GTypeInterface parent;
+
+	void (*draw)     (GPlotFunction *, cairo_t *, GPlotFunctionBBox *);
+	void (*get_bbox) (GPlotFunction *, GPlotFunctionBBox *);
+};
+
+#endif