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diff --git a/qt6/src/poppler-optcontent-private.h b/qt6/src/poppler-optcontent-private.h
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+/* poppler-optcontent-private.h: qt interface to poppler
+ *
+ * Copyright (C) 2007, Brad Hards <bradh@kde.org>
+ * Copyright (C) 2008, Pino Toscano <pino@kde.org>
+ * Copyright (C) 2016, 2018, 2019, 2021, Albert Astals Cid <aacid@kde.org>
+ * Copyright (C) 2017, Hubert Figuière <hub@figuiere.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef POPPLER_OPTCONTENT_PRIVATE_H
+#define POPPLER_OPTCONTENT_PRIVATE_H
+
+#include <QtCore/QMap>
+#include <QtCore/QSet>
+#include <QtCore/QString>
+
+class Array;
+class OCGs;
+class OptionalContentGroup;
+
+class QModelIndex;
+
+namespace Poppler {
+class OptContentItem;
+class OptContentModel;
+class OptContentModelPrivate;
+
+class RadioButtonGroup
+{
+public:
+    RadioButtonGroup(OptContentModelPrivate *ocModel, Array *rbarray);
+    ~RadioButtonGroup();
+    QSet<OptContentItem *> setItemOn(OptContentItem *itemToSetOn);
+
+private:
+    QList<OptContentItem *> itemsInGroup;
+};
+
+class OptContentItem
+{
+public:
+    enum ItemState
+    {
+        On,
+        Off,
+        HeadingOnly
+    };
+
+    explicit OptContentItem(OptionalContentGroup *group);
+    explicit OptContentItem(const QString &label);
+    OptContentItem();
+    ~OptContentItem();
+
+    QString name() const { return m_name; }
+    ItemState state() const { return m_stateBackup; }
+    void setState(ItemState state, bool obeyRadioGroups, QSet<OptContentItem *> &changedItems);
+
+    QList<OptContentItem *> childList() { return m_children; }
+
+    void setParent(OptContentItem *parent) { m_parent = parent; }
+    OptContentItem *parent() { return m_parent; }
+
+    void addChild(OptContentItem *child);
+
+    void appendRBGroup(RadioButtonGroup *rbgroup);
+
+    bool isEnabled() const { return m_enabled; }
+
+    QSet<OptContentItem *> recurseListChildren(bool includeMe = false) const;
+
+    OptionalContentGroup *group() const { return m_group; }
+
+private:
+    OptionalContentGroup *m_group;
+    QString m_name;
+    ItemState m_state; // true for ON, false for OFF
+    ItemState m_stateBackup;
+    QList<OptContentItem *> m_children;
+    OptContentItem *m_parent;
+    QList<RadioButtonGroup *> m_rbGroups;
+    bool m_enabled;
+};
+
+class OptContentModelPrivate
+{
+public:
+    OptContentModelPrivate(OptContentModel *qq, OCGs *optContent);
+    ~OptContentModelPrivate();
+
+    OptContentModelPrivate(const OptContentModelPrivate &) = delete;
+    OptContentModelPrivate &operator=(const OptContentModelPrivate &) = delete;
+
+    void parseRBGroupsArray(Array *rBGroupArray);
+    OptContentItem *nodeFromIndex(const QModelIndex &index, bool canBeNull = false) const;
+    QModelIndex indexFromItem(OptContentItem *node, int column) const;
+
+    /**
+       Get the OptContentItem corresponding to a given reference value.
+
+       \param ref the reference number (e.g. from Object.getRefNum()) to look up
+
+       \return the matching optional content item, or null if the reference wasn't found
+    */
+    OptContentItem *itemFromRef(const QString &ref) const;
+    void setRootNode(OptContentItem *node);
+
+    OptContentModel *q;
+
+    QMap<QString, OptContentItem *> m_optContentItems;
+    QList<OptContentItem *> m_headerOptContentItems;
+    QList<RadioButtonGroup *> m_rbgroups;
+    OptContentItem *m_rootNode;
+
+private:
+    void addChild(OptContentItem *parent, OptContentItem *child);
+    void parseOrderArray(OptContentItem *parentNode, Array *orderArray);
+};
+}
+
+#endif