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diff --git a/src/live_effects/lpe-perp_bisector.h b/src/live_effects/lpe-perp_bisector.h
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+++ b/src/live_effects/lpe-perp_bisector.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_LPE_PERP_BISECTOR_H
+#define INKSCAPE_LPE_PERP_BISECTOR_H
+
+/** \file
+ * LPE <perp_bisector> implementation, see lpe-perp_bisector.cpp.
+ */
+/*
+ * Authors:
+ *   Maximilian Albert
+ *   Johan Engelen
+ *
+ * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ * Copyright (C) Maximilin Albert 2008 <maximilian.albert@gmail.com>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/effect.h"
+#include "live_effects/parameter/parameter.h"
+#include "live_effects/parameter/point.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+namespace PB {
+  // we need a separate namespace to avoid clashes with LPETangentToCurve
+  class KnotHolderEntityEnd;
+  class KnotHolderEntityLeftEnd;
+  class KnotHolderEntityRightEnd;
+  void bisector_end_set(SPItem *item, Geom::Point const &p, guint state, bool left = true);
+}
+
+class LPEPerpBisector : public Effect {
+public:
+    LPEPerpBisector(LivePathEffectObject *lpeobject);
+    ~LPEPerpBisector() override;
+
+    virtual EffectType effectType () { return PERP_BISECTOR; }
+
+    void doOnApply (SPLPEItem const* lpeitem) override;
+
+    Geom::Piecewise<Geom::D2<Geom::SBasis> >
+      doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in) override;
+
+    /* the knotholder entity functions must be declared friends */
+    friend class PB::KnotHolderEntityEnd;
+    friend class PB::KnotHolderEntityLeftEnd;
+    friend class PB::KnotHolderEntityRightEnd;
+    friend void PB::bisector_end_set(SPItem *item, Geom::Point const &p, guint state, bool left);
+    void addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item);
+
+private:
+    ScalarParam length_left;
+    ScalarParam length_right;
+
+    Geom::Point A; // start of path
+    Geom::Point B; // end of path
+    Geom::Point M; // midpoint
+    Geom::Point C; // left end of bisector
+    Geom::Point D; // right end of bisector
+    Geom::Point perp_dir;
+
+    LPEPerpBisector(const LPEPerpBisector&) = delete;
+    LPEPerpBisector& operator=(const LPEPerpBisector&) = delete;
+};
+
+} //namespace LivePathEffect
+} //namespace Inkscape
+
+#endif