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diff --git a/vncviewer/KeyboardX11.h b/vncviewer/KeyboardX11.h
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+++ b/vncviewer/KeyboardX11.h
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+/* Copyright 2011-2021 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * 
+ * This 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 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software 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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifndef __KEYBOARDX11_H__
+#define __KEYBOARDX11_H__
+
+#include "Keyboard.h"
+
+class KeyboardX11 : public Keyboard
+{
+public:
+  KeyboardX11(KeyboardHandler* handler);
+  virtual ~KeyboardX11();
+
+  bool handleEvent(const void* event) override;
+
+  unsigned getLEDState() override;
+  void setLEDState(unsigned state) override;
+
+protected:
+  unsigned getModifierMask(uint32_t keysym);
+
+private:
+  int code_map_keycode_to_qnum[256];
+};
+
+#endif