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diff --git a/src/live_effects/lpe-angle_bisector.h b/src/live_effects/lpe-angle_bisector.h
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+++ b/src/live_effects/lpe-angle_bisector.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_LPE_ANGLE_BISECTOR_H
+#define INKSCAPE_LPE_ANGLE_BISECTOR_H
+
+/*
+ * Authors:
+ *   Maximilian Albert <maximilian.albert@gmail.com>
+ *   Johan Engelen <j.b.c.engelen@alumnus.utwente.nl>
+ *
+ * Copyright (C) Authors 2007-2012
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/effect.h"
+#include "live_effects/parameter/parameter.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+namespace AB {
+  // we use a separate namespace to avoid clashes with other LPEs
+  class KnotHolderEntityLeftEnd;
+  class KnotHolderEntityRightEnd;
+}
+
+class LPEAngleBisector : public Effect {
+public:
+    LPEAngleBisector(LivePathEffectObject *lpeobject);
+    ~LPEAngleBisector() override;
+
+    Geom::PathVector doEffect_path (Geom::PathVector const & path_in) override;
+
+    friend class AB::KnotHolderEntityLeftEnd;
+    friend class AB::KnotHolderEntityRightEnd;
+    void addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item);
+
+//private:
+    ScalarParam length_left;
+    ScalarParam length_right;
+
+    Geom::Point ptA;
+    Geom::Point dir;
+
+    LPEAngleBisector(const LPEAngleBisector&);
+    LPEAngleBisector& operator=(const LPEAngleBisector&);
+};
+
+} //namespace LivePathEffect
+} //namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :