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diff --git a/libgfortran/intrinsics/time_1.h b/libgfortran/intrinsics/time_1.h
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+++ b/libgfortran/intrinsics/time_1.h
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+/* Wrappers for platform timing functions.
+   Copyright (C) 2003, 2007, 2009, 2011 Free Software Foundation, Inc.
+
+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/>.  */
+
+#ifndef LIBGFORTRAN_TIME_H
+#define LIBGFORTRAN_TIME_H
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include <errno.h>
+
+/* The time related intrinsics (DTIME, ETIME, CPU_TIME) to "compare
+   different algorithms on the same computer or discover which parts
+   are the most expensive", need a way to get the CPU time with the
+   finest resolution possible. We can only be accurate up to
+   microseconds.
+
+   As usual with UNIX systems, unfortunately no single way is
+   available for all systems.  */
+
+#ifdef TIME_WITH_SYS_TIME
+#  include <sys/time.h>
+#  include <time.h>
+#else
+#  if HAVE_SYS_TIME_H
+#    include <sys/time.h>
+#  else
+#    ifdef HAVE_TIME_H
+#      include <time.h>
+#    endif
+#  endif
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
+     #include <sys/types.h>
+#endif
+
+/* The most accurate way to get the CPU time is getrusage (). */
+#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
+#  include <sys/resource.h>
+#endif  /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H  */
+
+/* The most accurate way to get the CPU time is getrusage ().
+   If we have times(), that's good enough, too.  */
+#if !defined (HAVE_GETRUSAGE) || !defined (HAVE_SYS_RESOURCE_H)
+/* For times(), we _must_ know the number of clock ticks per second.  */
+#  if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK))
+#    ifdef HAVE_SYS_PARAM_H
+#      include <sys/param.h>
+#    endif
+#    if defined (HAVE_SYS_TIMES_H)
+#      include <sys/times.h>
+#    endif
+#    ifndef HZ
+#      if defined _SC_CLK_TCK
+#        define HZ  sysconf(_SC_CLK_TCK)
+#      else
+#        define HZ  CLK_TCK
+#      endif
+#    endif
+#  endif  /* HAVE_TIMES etc.  */
+#endif  /* !HAVE_GETRUSAGE || !HAVE_SYS_RESOURCE_H  */
+
+
+/* If the re-entrant version of localtime is not available, provide a
+   fallback implementation.  On some targets where the _r version is
+   not available, localtime uses thread-local storage so it's
+   threadsafe.  */
+
+#ifndef HAVE_LOCALTIME_R
+/* If _POSIX is defined localtime_r gets defined by mingw-w64 headers.  */
+#ifdef localtime_r
+#undef localtime_r
+#endif
+
+static inline struct tm *
+localtime_r (const time_t * timep, struct tm * result)
+{
+  *result = *localtime (timep);
+  return result;
+}
+#endif
+
+
+#if defined (__GNUC__) && (__GNUC__ >= 3)
+#  define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
+#else
+#  define ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+static inline int gf_cputime (long *, long *, long *, long *) ATTRIBUTE_ALWAYS_INLINE;
+
+/* Helper function for the actual implementation of the DTIME, ETIME and
+   CPU_TIME intrinsics.  Returns 0 for success or -1 if no
+   CPU time could be computed.  */
+
+#ifdef __MINGW32__
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+static int
+gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
+{
+  union {
+    FILETIME ft;
+    unsigned long long ulltime;
+  } kernel_time,  user_time;
+
+  FILETIME unused1, unused2;
+
+  /* No support for Win9x.  The high order bit of the DWORD
+     returned by GetVersion is 0 for NT and higher. */
+  if (GetVersion () >= 0x80000000)
+    {
+      *user_sec = *system_sec = 0;
+      *user_usec = *system_usec = 0;
+      return -1;
+    }
+
+  /* The FILETIME structs filled in by GetProcessTimes represent
+     time in 100 nanosecond units. */
+  GetProcessTimes (GetCurrentProcess (), &unused1, &unused2,
+              	   &kernel_time.ft, &user_time.ft);
+
+  *user_sec = user_time.ulltime / 10000000;
+  *user_usec = (user_time.ulltime % 10000000) / 10;
+
+  *system_sec = kernel_time.ulltime / 10000000;
+  *system_usec = (kernel_time.ulltime % 10000000) / 10;
+  return 0;
+}
+
+#else
+
+static inline int
+gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
+{
+#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
+  struct rusage usage;
+  int err;
+  err = getrusage (RUSAGE_SELF, &usage);
+
+  *user_sec = usage.ru_utime.tv_sec;
+  *user_usec = usage.ru_utime.tv_usec;
+  *system_sec = usage.ru_stime.tv_sec;
+  *system_usec = usage.ru_stime.tv_usec;
+  return err;
+
+#elif defined HAVE_TIMES
+  struct tms buf;
+  clock_t err;
+  err = times (&buf);
+  *user_sec = buf.tms_utime / HZ;
+  *user_usec = buf.tms_utime % HZ * (1000000 / HZ);
+  *system_sec = buf.tms_stime / HZ;
+  *system_usec = buf.tms_stime % HZ * (1000000 / HZ);
+  if ((err == (clock_t) -1) && errno != 0)
+    return -1;
+  return 0;
+
+#else 
+
+  /* We have nothing to go on.  Return -1.  */
+  *user_sec = *system_sec = 0;
+  *user_usec = *system_usec = 0;
+  errno = ENOSYS;
+  return -1;
+
+#endif
+}
+
+#endif
+
+
+/* Realtime clock with microsecond resolution, falling back to less
+   precise functions if the target does not support gettimeofday().
+
+   Arguments:
+   secs     - OUTPUT, seconds
+   usecs    - OUTPUT, microseconds
+
+   The OUTPUT arguments shall represent the number of seconds and
+   nanoseconds since the Epoch.
+
+   Return value: 0 for success, -1 for error. In case of error, errno
+   is set.
+*/
+static inline int
+gf_gettime (time_t * secs, long * usecs)
+{
+#ifdef HAVE_GETTIMEOFDAY
+  struct timeval tv;
+  int err;
+  err = gettimeofday (&tv, NULL);
+  *secs = tv.tv_sec;
+  *usecs = tv.tv_usec;
+  return err;
+#elif HAVE_TIME
+  time_t t, t2;
+  t = time (&t2);
+  *secs = t2;
+  *usecs = 0;
+  if (t == ((time_t)-1))
+    return -1;
+  return 0;
+#else
+  *secs = 0;
+  *usecs = 0;
+  errno = ENOSYS;
+  return -1;
+#endif
+}
+
+
+#endif /* LIBGFORTRAN_TIME_H */