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diff --git a/src/extension/internal/pov-out.h b/src/extension/internal/pov-out.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * A simple utility for exporting Inkscape svg Shapes as PovRay bezier
+ * prisms.  Note that this is output-only, and would thus seem to be
+ * better placed as an 'export' rather than 'output'.  However, Export
+ * handles all or partial documents, while this outputs ALL shapes in
+ * the current SVG document.
+ *
+ * Authors:
+ *   Bob Jamison <ishmal@inkscape.org>
+ *
+ * Copyright (C) 2004-2008 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef EXTENSION_INTERNAL_POV_OUT_H
+#define EXTENSION_INTERNAL_POV_OUT_H
+
+#include <glib.h>
+#include "extension/implementation/implementation.h"
+
+class SPObject;
+class SPItem;
+
+namespace Inkscape
+{
+namespace Extension
+{
+namespace Internal
+{
+
+
+
+/**
+ * Output bezier splines in POVRay format.
+ * 
+ * For information, @see:  
+ * http://www.povray.org 
+ */ 
+class PovOutput : public Inkscape::Extension::Implementation::Implementation
+{
+
+
+public:
+
+    PovOutput();
+    
+    /**
+     * Our internal String definition
+     */
+    typedef Glib::ustring String;
+
+
+    /**
+     * Check whether we can actually output using this module
+     */
+	bool check (Inkscape::Extension::Extension * module) override;
+
+    /**
+     * API call to perform the output to a file
+     */
+    void save(Inkscape::Extension::Output *mod,
+              SPDocument *doc, gchar const *filename) override;
+
+    /**
+     * Inkscape runtime startup call.
+     */
+	static void init();
+	
+    /**
+     * Reset variables to initial state
+     */
+	void reset();
+	
+private:
+
+	/**
+	 * Format text to our output buffer
+	 */     	
+	void out(const char *fmt, ...) G_GNUC_PRINTF(2,3);
+
+    /**
+     * Output a 2d vector
+     */
+    void vec2(double a, double b);
+
+    /**
+     * Output a 3d vector
+     */
+    void vec3(double a, double b, double c);
+
+    /**
+     * Output a 4d vector
+     */
+    void vec4(double a, double b, double c, double d);
+
+    /**
+     * Output an rgbf color vector
+     */
+    void rgbf(double r, double g, double b, double f);
+
+    /**
+     * Output one bezier's start, start-control, 
+     *      end-control, and end nodes
+     */
+    void segment(int segNr, double a0, double a1,
+                            double b0, double b1,
+                            double c0, double c1,
+                            double d0, double d1);
+
+
+    /**
+     * Output the file header
+     */
+    bool doHeader();
+
+    /**
+     * Output the file footer
+     */
+    bool doTail();
+
+    /**
+     * Output the SVG document's curve data as POV curves
+     */
+    bool doCurve(SPItem *item, const String &id);
+    bool doTreeRecursive(SPDocument *doc, SPObject *obj);
+    bool doTree(SPDocument *doc);
+
+    /**
+     * Actual method to save document
+     */
+    void saveDocument(SPDocument *doc, gchar const *filename);
+
+
+    /**
+     * used for saving information about shapes
+     */
+    class PovShapeInfo
+    {
+    public:
+        PovShapeInfo()
+            = default;
+        PovShapeInfo(const PovShapeInfo &other)
+            { assign(other); }
+        PovShapeInfo& operator=(const PovShapeInfo &other)
+            { assign(other); return *this; }
+        virtual ~PovShapeInfo()
+            = default;
+        String id;
+        String color;
+
+    private:
+        void assign(const PovShapeInfo &other)
+            {
+            id    = other.id;
+            color = other.color;
+            }
+    };
+
+    //A list for saving information about the shapes
+    std::vector<PovShapeInfo> povShapes;
+    
+    //For formatted output
+	String outbuf;
+
+    //For statistics
+    int nrNodes;
+    int nrSegments;
+    int nrShapes;
+    int idIndex;
+    
+    double minx;
+    double miny;
+    double maxx;
+    double maxy;
+
+};
+
+
+
+
+}  // namespace Internal
+}  // namespace Extension
+}  // namespace Inkscape
+
+
+
+#endif /* EXTENSION_INTERNAL_POV_OUT_H */
+