diff --git a/test/widechars.h b/test/widechars.h
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--- /dev/null
+++ b/test/widechars.h
@@ -0,0 +1,71 @@
+/****************************************************************************
+ * Copyright (c) 2012 Free Software Foundation, Inc.                        *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+#ifndef __WIDECHARS_H
+#define __WIDECHARS_H 1
+
+#include <test.priv.h>
+
+#if USE_WIDEC_SUPPORT
+
+#if defined(__MINGW32__)
+/*
+ * MinGW has wide-character functions, but they do not work correctly.
+ */
+
+extern int _nc_mbtowc(wchar_t *pwc, const char *s, size_t n);
+extern int __MINGW_NOTHROW _nc_mbtowc(wchar_t *pwc, const char *s, size_t n);
+#define mbtowc(pwc,s,n) _nc_mbtowc(pwc,s,n)
+
+extern int __MINGW_NOTHROW _nc_mblen(const char *, size_t);
+#define mblen(s,n) _nc_mblen(s, n)
+
+#endif /* __MINGW32__ */
+
+#if HAVE_MBTOWC && HAVE_MBLEN
+#define reset_mbytes(state) IGNORE_RC(mblen(NULL, 0)), IGNORE_RC(mbtowc(NULL, NULL, 0))
+#define count_mbytes(buffer,length,state) mblen(buffer,length)
+#define check_mbytes(wch,buffer,length,state) \
+	(int) mbtowc(&wch, buffer, length)
+#define state_unused
+#elif HAVE_MBRTOWC && HAVE_MBRLEN
+#define reset_mbytes(state) init_mb(state)
+#define count_mbytes(buffer,length,state) mbrlen(buffer,length,&state)
+#define check_mbytes(wch,buffer,length,state) \
+	(int) mbrtowc(&wch, buffer, length, &state)
+#else
+make an error
+#endif
+
+#else
+
+#endif /* USE_WIDEC_SUPPORT */
+
+extern void widechars_stub(void);
+
+#endif /* __WIDECHARS_H */