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diff --git a/gl/wctype.in.h b/gl/wctype.in.h
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+/* A substitute for ISO C99 <wctype.h>, for platforms that lack it.
+
+   Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+
+   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 3, 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.  */
+
+/* Written by Bruno Haible and Paul Eggert.  */
+
+/*
+ * ISO C 99 <wctype.h> for platforms that lack it.
+ * <http://www.opengroup.org/susv3xbd/wctype.h.html>
+ *
+ * iswctype, towctrans, towlower, towupper, wctrans, wctype,
+ * wctrans_t, and wctype_t are not yet implemented.
+ */
+
+#ifndef _GL_WCTYPE_H
+
+#if @HAVE_WINT_T@
+/* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.
+   Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
+   included before <wchar.h>.  */
+# include <stddef.h>
+# include <stdio.h>
+# include <time.h>
+# include <wchar.h>
+#endif
+
+/* Include the original <wctype.h> if it exists.
+   BeOS 5 has the functions but no <wctype.h>.  */
+/* The include_next requires a split double-inclusion guard.  */
+#if @HAVE_WCTYPE_H@
+# @INCLUDE_NEXT@ @NEXT_WCTYPE_H@
+#endif
+
+#ifndef _GL_WCTYPE_H
+#define _GL_WCTYPE_H
+
+#if @HAVE_WINT_T@
+typedef wint_t __wctype_wint_t;
+#else
+typedef int __wctype_wint_t;
+#endif
+
+/* FreeBSD 4.4 to 4.11 has <wctype.h> but lacks the functions.
+   Assume all 12 functions are implemented the same way, or not at all.  */
+#if ! @HAVE_ISWCNTRL@
+
+/* IRIX 5.3 has macros but no functions, its isw* macros refer to an
+   undefined variable _ctmp_ and to <ctype.h> macros like _P, and they
+   refer to system functions like _iswctype that are not in the
+   standard C library.  Rather than try to get ancient buggy
+   implementations like this to work, just disable them.  */
+#  undef iswalnum
+#  undef iswalpha
+#  undef iswblank
+#  undef iswcntrl
+#  undef iswdigit
+#  undef iswgraph
+#  undef iswlower
+#  undef iswprint
+#  undef iswpunct
+#  undef iswspace
+#  undef iswupper
+#  undef iswxdigit
+
+static inline int
+iswalnum (__wctype_wint_t wc)
+{
+  return ((wc >= '0' && wc <= '9')
+	  || ((wc & ~0x20) >= 'A' && (wc & ~0x20) <= 'Z'));
+}
+
+static inline int
+iswalpha (__wctype_wint_t wc)
+{
+  return (wc & ~0x20) >= 'A' && (wc & ~0x20) <= 'Z';
+}
+
+static inline int
+iswblank (__wctype_wint_t wc)
+{
+  return wc == ' ' || wc == '\t';
+}
+
+static inline int
+iswcntrl (__wctype_wint_t wc)
+{
+  return (wc & ~0x1f) == 0 || wc == 0x7f;
+}
+
+static inline int
+iswdigit (__wctype_wint_t wc)
+{
+  return wc >= '0' && wc <= '9';
+}
+
+static inline int
+iswgraph (__wctype_wint_t wc)
+{
+  return wc >= '!' && wc <= '~';
+}
+
+static inline int
+iswlower (__wctype_wint_t wc)
+{
+  return wc >= 'a' && wc <= 'z';
+}
+
+static inline int
+iswprint (__wctype_wint_t wc)
+{
+  return wc >= ' ' && wc <= '~';
+}
+
+static inline int
+iswpunct (__wctype_wint_t wc)
+{
+  return (wc >= '!' && wc <= '~'
+	  && !((wc >= '0' && wc <= '9')
+	       || ((wc & ~0x20) >= 'A' && (wc & ~0x20) <= 'Z')));
+}
+
+static inline int
+iswspace (__wctype_wint_t wc)
+{
+  return (wc == ' ' || wc == '\t'
+	  || wc == '\n' || wc == '\v' || wc == '\f' || wc == '\r');
+}
+
+static inline int
+iswupper (__wctype_wint_t wc)
+{
+  return wc >= 'A' && wc <= 'Z';
+}
+
+static inline int
+iswxdigit (__wctype_wint_t wc)
+{
+  return ((wc >= '0' && wc <= '9')
+	  || ((wc & ~0x20) >= 'A' && (wc & ~0x20) <= 'F'));
+}
+
+# endif /* ! HAVE_ISWCNTRL */
+
+#endif /* _GL_WCTYPE_H */
+#endif /* _GL_WCTYPE_H */