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diff --git a/m4/libunistring.m4 b/m4/libunistring.m4
new file mode 100644
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+++ b/m4/libunistring.m4
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+# libunistring.m4 serial 11
+dnl Copyright (C) 2009-2012 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 gl_LIBUNISTRING
+dnl Searches for an installed libunistring.
+dnl If found, it sets and AC_SUBSTs HAVE_LIBUNISTRING=yes and the LIBUNISTRING
+dnl and LTLIBUNISTRING variables, sets the LIBUNISTRING_VERSION variable, and
+dnl augments the CPPFLAGS variable, and #defines HAVE_LIBUNISTRING to 1.
+dnl Otherwise, it sets and AC_SUBSTs HAVE_LIBUNISTRING=no and LIBUNISTRING and
+dnl LTLIBUNISTRING to empty.
+
+dnl Define gl_LIBUNISTRING using AC_DEFUN_ONCE for Autoconf >= 2.64, in order
+dnl to avoid warnings like
+dnl "warning: AC_REQUIRE: `gl_LIBUNISTRING' was expanded before it was required".
+dnl This is tricky because of the way 'aclocal' is implemented:
+dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
+dnl   Otherwise aclocal's initial scan pass would miss the macro definition.
+dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
+dnl   Otherwise aclocal would emit many "Use of uninitialized value $1"
+dnl   warnings.
+m4_define([gl_libunistring_AC_DEFUN],
+  m4_version_prereq([2.64],
+    [[AC_DEFUN_ONCE(
+        [$1], [$2])]],
+    [m4_ifdef([gl_00GNULIB],
+       [[AC_DEFUN_ONCE(
+           [$1], [$2])]],
+       [[AC_DEFUN(
+           [$1], [$2])]])]))
+gl_libunistring_AC_DEFUN([gl_LIBUNISTRING],
+[
+  AC_BEFORE([$0], [gl_LIBUNISTRING_MODULE])
+  AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
+  AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
+
+  m4_ifdef([gl_LIBUNISTRING_OPTIONAL],
+    [
+      AC_MSG_CHECKING([whether included libunistring is requested])
+      AC_ARG_WITH([included-libunistring],
+        [  --with-included-libunistring  use the libunistring parts included here],
+        [gl_libunistring_force_included=$withval],
+        [gl_libunistring_force_included=no])
+      AC_MSG_RESULT([$gl_libunistring_force_included])
+      gl_libunistring_use_included="$gl_libunistring_force_included"
+      if test "$gl_libunistring_use_included" = yes; then
+        dnl Assume that libunistring is not installed until some other macro
+        dnl explicitly invokes gl_LIBUNISTRING_CORE.
+        if test -z "$HAVE_LIBUNISTRING"; then
+          HAVE_LIBUNISTRING=no
+        fi
+        LIBUNISTRING=
+        LTLIBUNISTRING=
+      else
+        gl_LIBUNISTRING_CORE
+        if test $HAVE_LIBUNISTRING = no; then
+          gl_libunistring_use_included=yes
+          LIBUNISTRING=
+          LTLIBUNISTRING=
+        fi
+      fi
+    ],
+    [gl_LIBUNISTRING_CORE])
+])
+
+AC_DEFUN([gl_LIBUNISTRING_CORE],
+[
+  AC_REQUIRE([AM_ICONV])
+  if test -n "$LIBICONV"; then
+    dnl First, try to link without -liconv. libunistring often depends on
+    dnl libiconv, but we don't know (and often don't need to know) where
+    dnl libiconv is installed.
+    AC_LIB_HAVE_LINKFLAGS([unistring], [],
+      [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
+      [no, trying again together with libiconv])
+    if test "$ac_cv_libunistring" != yes; then
+      dnl Second try, with -liconv.
+      dnl We have to erase the cached result of the first AC_LIB_HAVE_LINKFLAGS
+      dnl invocation, otherwise the second one will not be run.
+      unset ac_cv_libunistring
+      glus_save_LIBS="$LIBS"
+      LIBS="$LIBS $LIBICONV"
+      AC_LIB_HAVE_LINKFLAGS([unistring], [],
+        [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
+        [no, consider installing GNU libunistring])
+      if test -n "$LIBUNISTRING"; then
+        LIBUNISTRING="$LIBUNISTRING $LIBICONV"
+        LTLIBUNISTRING="$LTLIBUNISTRING $LTLIBICONV"
+      fi
+      LIBS="$glus_save_LIBS"
+    fi
+  else
+    AC_LIB_HAVE_LINKFLAGS([unistring], [],
+      [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
+      [no, consider installing GNU libunistring])
+  fi
+  if test $HAVE_LIBUNISTRING = yes; then
+    dnl Determine the installed version.
+    AC_CACHE_CHECK([for libunistring version], [gl_cv_libunistring_version],
+      [AC_COMPUTE_INT([gl_libunistring_hexversion],
+                      [_LIBUNISTRING_VERSION],
+                      [#include <unistring/version.h>])
+       dnl Versions <= 0.9.3 had a hexversion of 0x0009.
+       dnl Use other tests to distinguish them.
+       if test $gl_libunistring_hexversion = 9; then
+         dnl Version 0.9.2 introduced the header <unistring/cdefs.h>.
+         AC_COMPILE_IFELSE(
+           [AC_LANG_PROGRAM([[#include <unistring/cdefs.h>]], [[]])],
+           [gl_cv_libunistring_version092=true],
+           [gl_cv_libunistring_version092=false])
+         if $gl_cv_libunistring_version092; then
+           dnl Version 0.9.3 changed a comment in <unistr.h>.
+           gl_ABSOLUTE_HEADER_ONE([unistr.h])
+           if test -n "$gl_cv_absolute_unistr_h" \
+              && grep 'Copy no more than N units of SRC to DEST.  Return a pointer' $gl_cv_absolute_unistr_h > /dev/null; then
+             dnl Detected version 0.9.3.
+             gl_libunistring_hexversion=2307
+           else
+             dnl Detected version 0.9.2.
+             gl_libunistring_hexversion=2306
+           fi
+         else
+           dnl Version 0.9.1 introduced the type casing_suffix_context_t.
+           AC_COMPILE_IFELSE(
+             [AC_LANG_PROGRAM(
+                [[#include <unicase.h>
+                  casing_suffix_context_t ct;]],
+                [[]])],
+             [gl_cv_libunistring_version091=true],
+             [gl_cv_libunistring_version091=false])
+           if $gl_cv_libunistring_version091; then
+             dnl Detected version 0.9.1.
+             gl_libunistring_hexversion=2305
+           else
+             dnl Detected version 0.9.
+             gl_libunistring_hexversion=2304
+           fi
+         fi
+       fi
+       dnl Transform into the usual major.minor.subminor notation.
+       gl_libunistring_major=`expr $gl_libunistring_hexversion / 65536`
+       gl_libunistring_minor=`expr $gl_libunistring_hexversion / 256 % 256`
+       gl_libunistring_subminor=`expr $gl_libunistring_hexversion % 256`
+       gl_cv_libunistring_version="$gl_libunistring_major.$gl_libunistring_minor.$gl_libunistring_subminor"
+      ])
+    LIBUNISTRING_VERSION="$gl_cv_libunistring_version"
+  fi
+])