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diff --git a/src/gui/platform/unix/qxkbcommon_p.h b/src/gui/platform/unix/qxkbcommon_p.h
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+++ b/src/gui/platform/unix/qxkbcommon_p.h
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+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QXKBCOMMON_P_H
+#define QXKBCOMMON_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtGui/qtguiglobal.h>
+#include <QtCore/qstring.h>
+#include <QtCore/qloggingcategory.h>
+#include <QtCore/qlist.h>
+#include <QtCore/private/qglobal_p.h>
+
+#include <xkbcommon/xkbcommon.h>
+
+#include <qpa/qplatformkeymapper.h>
+
+#include <memory>
+
+QT_BEGIN_NAMESPACE
+
+class QEvent;
+class QKeyEvent;
+class QPlatformInputContext;
+
+class Q_GUI_EXPORT QXkbCommon
+{
+public:
+    static QString lookupString(struct xkb_state *state, xkb_keycode_t code);
+    static QString lookupStringNoKeysymTransformations(xkb_keysym_t keysym);
+
+    static QList<xkb_keysym_t> toKeysym(QKeyEvent *event);
+
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers);
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                             xkb_state *state, xkb_keycode_t code,
+                             bool superAsMeta = true, bool hyperAsMeta = true);
+
+    // xkbcommon_* API is part of libxkbcommon internals, with modifications as
+    // described in the header of the implementation file.
+    static void xkbcommon_XConvertCase(xkb_keysym_t sym, xkb_keysym_t *lower, xkb_keysym_t *upper);
+    static xkb_keysym_t qxkbcommon_xkb_keysym_to_upper(xkb_keysym_t ks);
+
+    static Qt::KeyboardModifiers modifiers(struct xkb_state *state, xkb_keysym_t keysym = XKB_KEY_VoidSymbol);
+
+    static QList<int> possibleKeys(xkb_state *state,
+        const QKeyEvent *event, bool superAsMeta = false, bool hyperAsMeta = false);
+    static QList<QKeyCombination> possibleKeyCombinations(xkb_state *state,
+        const QKeyEvent *event, bool superAsMeta = false, bool hyperAsMeta = false);
+
+    static void verifyHasLatinLayout(xkb_keymap *keymap);
+    static xkb_keysym_t lookupLatinKeysym(xkb_state *state, xkb_keycode_t keycode);
+
+    static bool isLatin1(xkb_keysym_t sym) {
+        return sym >= 0x20 && sym <= 0xff;
+    }
+    static bool isKeypad(xkb_keysym_t sym) {
+        switch (sym) {
+        case XKB_KEY_KP_Space:
+        case XKB_KEY_KP_Tab:
+        case XKB_KEY_KP_Enter:
+        case XKB_KEY_KP_F1:
+        case XKB_KEY_KP_F2:
+        case XKB_KEY_KP_F3:
+        case XKB_KEY_KP_F4:
+        case XKB_KEY_KP_Home:
+        case XKB_KEY_KP_Left:
+        case XKB_KEY_KP_Up:
+        case XKB_KEY_KP_Right:
+        case XKB_KEY_KP_Down:
+        case XKB_KEY_KP_Prior:
+        case XKB_KEY_KP_Next:
+        case XKB_KEY_KP_End:
+        case XKB_KEY_KP_Begin:
+        case XKB_KEY_KP_Insert:
+        case XKB_KEY_KP_Delete:
+        case XKB_KEY_KP_Equal:
+        case XKB_KEY_KP_Multiply:
+        case XKB_KEY_KP_Add:
+        case XKB_KEY_KP_Separator:
+        case XKB_KEY_KP_Subtract:
+        case XKB_KEY_KP_Decimal:
+        case XKB_KEY_KP_Divide:
+        case XKB_KEY_KP_0:
+        case XKB_KEY_KP_1:
+        case XKB_KEY_KP_2:
+        case XKB_KEY_KP_3:
+        case XKB_KEY_KP_4:
+        case XKB_KEY_KP_5:
+        case XKB_KEY_KP_6:
+        case XKB_KEY_KP_7:
+        case XKB_KEY_KP_8:
+        case XKB_KEY_KP_9:
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    static void setXkbContext(QPlatformInputContext *inputContext, struct xkb_context *context);
+
+    struct XKBStateDeleter {
+        void operator()(struct xkb_state *state) const { return xkb_state_unref(state); }
+    };
+    struct XKBKeymapDeleter {
+        void operator()(struct xkb_keymap *keymap) const { return xkb_keymap_unref(keymap); }
+    };
+    struct XKBContextDeleter {
+        void operator()(struct xkb_context *context) const { return xkb_context_unref(context); }
+    };
+    using ScopedXKBState = std::unique_ptr<struct xkb_state, XKBStateDeleter>;
+    using ScopedXKBKeymap = std::unique_ptr<struct xkb_keymap, XKBKeymapDeleter>;
+    using ScopedXKBContext = std::unique_ptr<struct xkb_context, XKBContextDeleter>;
+};
+
+QT_END_NAMESPACE
+
+#endif // QXKBCOMMON_P_H