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diff --git a/src/perspective-line.h b/src/perspective-line.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Perspective line for 3D perspectives
+ *
+ * Authors:
+ *   Maximilian Albert <Anhalter42@gmx.de>
+ *
+ * Copyright (C) 2007 authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_PERSPECTIVE_LINE_H
+#define SEEN_PERSPECTIVE_LINE_H
+
+#include "line-geometry.h"
+
+class SPDesktop;
+
+namespace Box3D {
+
+class PerspectiveLine : public Box3D::Line {
+public:
+    /** 
+     * Create a perspective line starting at 'pt' and pointing in the direction of the
+     * vanishing point corresponding to 'axis'. If the VP has style VP_FINITE then the
+     * PL runs through it; otherwise it has the direction specified by the v_dir vector
+     * of the VP.
+     */
+    PerspectiveLine (Geom::Point const &pt, Proj::Axis const axis, Persp3D const *persp);
+
+private:
+    Proj::Axis vp_dir; // direction of the associated VP
+    Persp3D const *persp;
+};
+
+
+} // namespace Box3D
+
+
+#endif /* !SEEN_PERSPECTIVE_LINE_H */
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :