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diff --git a/src/conn-avoid-ref.h b/src/conn-avoid-ref.h
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+++ b/src/conn-avoid-ref.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_CONN_AVOID_REF
+#define SEEN_CONN_AVOID_REF
+
+/** \file
+ * A class for handling shape interaction with libavoid.
+ */
+/*
+ * Authors:
+ *   Michael Wybrow <mjwybrow@users.sourceforge.net>
+ *
+ * Copyright (C) 2005 Michael Wybrow
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/point.h>
+#include <cstddef>
+#include <sigc++/connection.h>
+
+class  SPDesktop;
+class SPObject;
+class  SPItem;
+namespace Avoid { class ShapeRef; }
+
+class SPAvoidRef {
+public:
+    SPAvoidRef(SPItem *spitem);
+    virtual ~SPAvoidRef();
+
+    // libavoid's internal representation of the item.
+    Avoid::ShapeRef *shapeRef;
+
+    void setAvoid(char const *value);
+    void handleSettingChange();
+
+    Geom::Point getConnectionPointPos();
+
+    // Returns a list of SPItems of all connectors/shapes attached to
+    // this object.  Pass one of the following for 'type':
+    //     Avoid::runningTo
+    //     Avoid::runningFrom
+    //     Avoid::runningToAndFrom
+    std::vector<SPItem *> getAttachedShapes(const unsigned int type);
+    std::vector<SPItem *> getAttachedConnectors(const unsigned int type);
+
+private:
+    SPItem *item;
+
+    // true if avoiding, false if not.
+    bool setting;
+    bool new_setting;
+
+    // A sigc connection for transformed signal.
+    sigc::connection _transformed_connection;
+};
+
+extern std::vector<SPItem *> get_avoided_items(std::vector<SPItem *> &list, SPObject *from,
+        SPDesktop *desktop, bool initialised = true);
+extern void avoid_item_move(Geom::Affine const *mp, SPItem *moved_item);
+extern void init_avoided_shape_geometry(SPDesktop *desktop);
+
+static const double defaultConnSpacing = 3.0;
+static const double defaultConnCurvature = 3.0;
+
+#endif /* !SEEN_CONN_AVOID_REF */
+
+/*
+  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 :