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diff --git a/libgfortran/m4/norm2.m4 b/libgfortran/m4/norm2.m4
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+++ b/libgfortran/m4/norm2.m4
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+`/* Implementation of the NORM2 intrinsic
+   Copyright 2010 Free Software Foundation, Inc.
+   Contributed by Tobias Burnus  <burnus@net-b.de>
+
+This file is part of the GNU Fortran runtime library (libgfortran).
+
+Libgfortran 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 of the License, or (at your option) any later version.
+
+Libgfortran 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+#include <stdlib.h>
+#include <math.h>
+#include <assert.h>'
+
+include(iparm.m4)dnl
+include(ifunction.m4)dnl
+include(`mtype.m4')dnl
+
+`#if defined (HAVE_'atype_name`) && defined (HAVE_'rtype_name`) && 'hasmathfunc(sqrt) && hasmathfunc(fabs)
+
+mathfunc_macro
+
+ARRAY_FUNCTION(0,
+`	'rtype_name` scale;
+	result = 0;
+	scale = 1;',
+`	  if (*src != 0)
+	    {
+	      'rtype_name` absX, val;
+	      absX = MATHFUNC(fabs) (*src);
+	      if (scale < absX)
+		{
+		  val = scale / absX;
+		  result = 1 + result * val * val;
+		  scale = absX;
+		}
+	      else
+		{
+		  val = absX / scale;
+		  result += val * val;
+		}
+	    }',
+`   result = scale * MATHFUNC(sqrt) (result);')
+
+#endif