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diff --git a/device/include/wchar.h b/device/include/wchar.h
new file mode 100644
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--- /dev/null
+++ b/device/include/wchar.h
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+/*-------------------------------------------------------------------------
+   wchar.h - Extended and multibyte wide character utilitites (ISO C 11 7.29)
+
+   Copyright (c) 2015-2016, Philipp Klaus Krause / pkk@spth.de
+
+   This library 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 library 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 library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+#ifndef __SDCC_WCHAR_H
+#define __SDCC_WCHAR_H 1
+
+#ifndef __WCHAR_T_DEFINED
+#define __WCHAR_T_DEFINED
+  typedef unsigned long int wchar_t;
+#endif
+
+#ifndef __SIZE_T_DEFINED
+#define __SIZE_T_DEFINED
+  typedef unsigned int size_t;
+#endif
+
+#ifndef __MBSTATE_T_DEFINED
+#define __MBSTATE_T_DEFINED
+  typedef struct {unsigned char c[3];} mbstate_t;
+#endif
+
+#ifndef __WINT_T_DEFINED
+#define __WINT_T_DEFINED
+  typedef unsigned long int wint_t;
+#endif
+
+struct tm;
+
+#ifndef WEOF
+  #define WEOF 0xfffffffful
+#endif
+
+/* C99 Wide string comparison functions (ISO C11 7.29.4.4) */
+int wcscmp(const wchar_t *s1, const wchar_t *s2);
+
+/* C99 Miscellaneous functions (ISO C11 7.29.4.6) */
+size_t wcslen(const wchar_t *s);
+
+/* C99 Single-byte/wide character conversion functions (ISO C 11 7.29.6.1) */
+wint_t btowc(int c);
+int wctob(wint_t c);
+
+/* C99 Conversion state functions (ISO C 11 7.29.6.2) */
+int mbsinit(const mbstate_t *ps);
+
+/* C99 Restartable multibyte/wide character conversion functions (ISO C 11 7.29.6.3) */
+size_t mbrlen(const char *restrict s, size_t n, mbstate_t *restrict ps);
+size_t mbrtowc(wchar_t *restrict pwc, const char *restrict s, size_t n, mbstate_t *restrict ps);
+size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict ps);
+
+#endif /* __SDCC_WCHAR_H */