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diff --git a/libgfortran/intrinsics/sleep.c b/libgfortran/intrinsics/sleep.c
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+++ b/libgfortran/intrinsics/sleep.c
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+/* Implementation of the SLEEP intrinsic.
+   Copyright (C) 2005 Free Software Foundation, Inc.
+   Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
+
+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 2 of the License, or (at your option) any later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+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.
+
+You should have received a copy of the GNU General Public
+License along with libgfortran; see the file COPYING.  If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "config.h"
+#include "libgfortran.h"
+
+#include <errno.h>
+
+#include "../io/io.h"
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+/* SUBROUTINE SLEEP(SECONDS)
+   INTEGER, INTENT(IN) :: SECONDS
+   
+   A choice had to be made if SECONDS is negative. For g77, this is
+   equivalent to SLEEP(0).  */
+
+#ifdef HAVE_SLEEP
+extern void sleep_i4_sub (GFC_INTEGER_4 *);
+iexport_proto(sleep_i4_sub);
+
+void
+sleep_i4_sub (GFC_INTEGER_4 *seconds)
+{
+  sleep (*seconds < 0 ? 0 : (unsigned int) *seconds);
+}
+iexport(sleep_i4_sub);
+
+extern void sleep_i8_sub (GFC_INTEGER_8 *);
+iexport_proto(sleep_i8_sub);
+
+void
+sleep_i8_sub (GFC_INTEGER_8 *seconds)
+{
+  sleep (*seconds < 0 ? 0 : (unsigned int) *seconds);
+}
+iexport(sleep_i8_sub);
+#endif