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diff --git a/gl/m4/locale-ja.m4 b/gl/m4/locale-ja.m4
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+# locale-ja.m4 serial 6
+dnl Copyright (C) 2003, 2005-2009 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Bruno Haible.
+
+dnl Determine the name of a japanese locale with EUC-JP encoding.
+AC_DEFUN([gt_LOCALE_JA],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([AM_LANGINFO_CODESET])
+  AC_CACHE_CHECK([for a traditional japanese locale], [gt_cv_locale_ja], [
+    macosx=
+changequote(,)dnl
+    case "$host_os" in
+      darwin[56]*) ;;
+      darwin*) macosx=yes;;
+    esac
+changequote([,])dnl
+    if test -n "$macosx"; then
+      # On Darwin 7 (MacOS X), the libc supports some locales in non-UTF-8
+      # encodings, but the kernel does not support them. The documentation
+      # says:
+      #   "... all code that calls BSD system routines should ensure
+      #    that the const *char parameters of these routines are in UTF-8
+      #    encoding. All BSD system functions expect their string
+      #    parameters to be in UTF-8 encoding and nothing else."
+      # See the comments in config.charset. Therefore we bypass the test.
+      gt_cv_locale_ja=none
+    else
+      AC_LANG_CONFTEST([AC_LANG_SOURCE([
+changequote(,)dnl
+#include <locale.h>
+#include <time.h>
+#if HAVE_LANGINFO_CODESET
+# include <langinfo.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+struct tm t;
+char buf[16];
+int main ()
+{
+  const char *p;
+  /* Check whether the given locale name is recognized by the system.  */
+  if (setlocale (LC_ALL, "") == NULL) return 1;
+  /* Check whether nl_langinfo(CODESET) is nonempty and not "ASCII" or "646".
+     On MacOS X 10.3.5 (Darwin 7.5) in the fr_FR locale, nl_langinfo(CODESET)
+     is empty, and the behaviour of Tcl 8.4 in this locale is not useful.
+     On OpenBSD 4.0, when an unsupported locale is specified, setlocale()
+     succeeds but then nl_langinfo(CODESET) is "646". In this situation,
+     some unit tests fail.  */
+#if HAVE_LANGINFO_CODESET
+  {
+    const char *cs = nl_langinfo (CODESET);
+    if (cs[0] == '\0' || strcmp (cs, "ASCII") == 0 || strcmp (cs, "646") == 0)
+      return 1;
+  }
+#endif
+#ifdef __CYGWIN__
+  /* On Cygwin, avoid locale names without encoding suffix, because the
+     locale_charset() function relies on the encoding suffix.  Note that
+     LC_ALL is set on the command line.  */
+  if (strchr (getenv ("LC_ALL"), '.') == NULL) return 1;
+#endif
+  /* Check whether MB_CUR_MAX is > 1.  This excludes the dysfunctional locales
+     on Cygwin 1.5.x.  */
+  if (MB_CUR_MAX == 1)
+    return 1;
+  /* Check whether in a month name, no byte in the range 0x80..0x9F occurs.
+     This excludes the UTF-8 encoding.  */
+  t.tm_year = 1975 - 1900; t.tm_mon = 2 - 1; t.tm_mday = 4;
+  if (strftime (buf, sizeof (buf), "%B", &t) < 2) return 1;
+  for (p = buf; *p != '\0'; p++)
+    if ((unsigned char) *p >= 0x80 && (unsigned char) *p < 0xa0)
+      return 1;
+  return 0;
+}
+changequote([,])dnl
+        ])])
+      if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
+        # Setting LC_ALL is not enough. Need to set LC_TIME to empty, because
+        # otherwise on MacOS X 10.3.5 the LC_TIME=C from the beginning of the
+        # configure script would override the LC_ALL setting. Likewise for
+        # LC_CTYPE, which is also set at the beginning of the configure script.
+        # Test for the AIX locale name.
+        if (LC_ALL=ja_JP LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+          gt_cv_locale_ja=ja_JP
+        else
+          # Test for the locale name with explicit encoding suffix.
+          if (LC_ALL=ja_JP.EUC-JP LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+            gt_cv_locale_ja=ja_JP.EUC-JP
+          else
+            # Test for the HP-UX, OSF/1, NetBSD locale name.
+            if (LC_ALL=ja_JP.eucJP LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+              gt_cv_locale_ja=ja_JP.eucJP
+            else
+              # Test for the IRIX, FreeBSD locale name.
+              if (LC_ALL=ja_JP.EUC LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+                gt_cv_locale_ja=ja_JP.EUC
+              else
+                # Test for the Solaris 7 locale name.
+                if (LC_ALL=ja LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+                  gt_cv_locale_ja=ja
+                else
+                  # Special test for NetBSD 1.6.
+                  if test -f /usr/share/locale/ja_JP.eucJP/LC_CTYPE; then
+                    gt_cv_locale_ja=ja_JP.eucJP
+                  else
+                    # None found.
+                    gt_cv_locale_ja=none
+                  fi
+                fi
+              fi
+            fi
+          fi
+        fi
+      fi
+      rm -fr conftest*
+    fi
+  ])
+  LOCALE_JA=$gt_cv_locale_ja
+  AC_SUBST([LOCALE_JA])
+])