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diff --git a/libgfortran/m4/rrspacing.m4 b/libgfortran/m4/rrspacing.m4
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+++ b/libgfortran/m4/rrspacing.m4
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+`/* Implementation of the RRSPACING intrinsic
+   Copyright 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
+   Contributed by Steven G. Kargl <kargl@gcc.gnu.org>
+
+This file is part of the GNU Fortran 95 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(`mtype.m4')dnl
+
+mathfunc_macro
+
+`#if defined (HAVE_'real_type`) && 'hasmathfunc(fabs) && hasmathfunc(frexp)`
+
+extern 'real_type` rrspacing_r'kind` ('real_type` s, int p);
+export_proto(rrspacing_r'kind`);
+
+'real_type`
+rrspacing_r'kind` ('real_type` s, int p)
+{
+  int e;
+  'real_type` x;
+  x = MATHFUNC(fabs) (s);
+  if (x == 0.)
+    return 0.;
+  MATHFUNC(frexp) (s, &e);
+#if 'hasmathfunc(ldexp)`
+  return MATHFUNC(ldexp) (x, p - e);
+#else
+  return MATHFUNC(scalbn) (x, p - e);
+#endif
+
+}
+
+#endif'