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diff --git a/engines/glk/alan2/decode.h b/engines/glk/alan2/decode.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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
+ * of the License, 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 GLK_ALAN2_DECODE
+#define GLK_ALAN2_DECODE
+
+#include "glk/alan2/types.h"
+
+/* Arithmetic decoding module in Arun
+ */
+
+namespace Glk {
+namespace Alan2 {
+
+#ifdef _PROTOTYPES_
+extern void startDecoding(void);
+extern int decodeChar(void);
+extern void *pushDecode(void);
+extern void popDecode(void *info);
+#else
+extern void startDecoding();
+extern int decodeChar();
+extern void *pushDecode();
+extern void popDecode();
+#endif
+
+} // End of namespace Alan2
+} // End of namespace Glk
+
+#endif