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diff --git a/gnulib/m4/libunistring-optional.m4 b/gnulib/m4/libunistring-optional.m4
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+# libunistring-optional.m4 serial 1
+dnl Copyright (C) 2010-2011 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_OPTIONAL
+dnl Searches for an installed libunistring or uses the included source code
+dnl parts.
+dnl If found, it sets and AC_SUBSTs HAVE_LIBUNISTRING=yes and the LIBUNISTRING
+dnl and LTLIBUNISTRING variables and augments the CPPFLAGS variable, and
+dnl #defines HAVE_LIBUNISTRING to 1. Otherwise, it sets and AC_SUBSTs
+dnl HAVE_LIBUNISTRING=no and LIBUNISTRING and LTLIBUNISTRING to empty.
+
+AC_DEFUN([gl_LIBUNISTRING_OPTIONAL],
+[
+ dnl gl_LIBUNISTRING does a couple of extra things if this macro is used.
+ AC_REQUIRE([gl_LIBUNISTRING])
+
+ AC_MSG_CHECKING([whether to use the included libunistring])
+ AC_MSG_RESULT([$gl_libunistring_use_included])
+])