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diff --git a/gnulib-tests/test-utimens-common.h b/gnulib-tests/test-utimens-common.h
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+/* Test of file timestamp modification functions.
+   Copyright (C) 2009-2022 Free Software Foundation, Inc.
+
+   This program 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.
+
+   This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* This file defines some prerequisites useful to utime-related tests.  */
+
+#ifndef GL_TEST_UTIMENS_COMMON
+# define GL_TEST_UTIMENS_COMMON
+
+# include <fcntl.h>
+# include <errno.h>
+# include <string.h>
+# include <sys/stat.h>
+# include <unistd.h>
+
+/* Gnulib modules.  */
+# include "stat-time.h"
+# include "timespec.h"
+# include "utimecmp.h"
+
+/* Gnulib test header.  */
+# include "nap.h"
+
+enum {
+  BILLION = 1000 * 1000 * 1000,
+
+  Y2K = 946684800, /* Jan 1, 2000, in seconds since epoch.  */
+
+  /* Bogus positive and negative tv_nsec values closest to valid
+     range, but without colliding with UTIME_NOW or UTIME_OMIT.  */
+  UTIME_BOGUS_POS = BILLION + ((UTIME_NOW == BILLION || UTIME_OMIT == BILLION)
+                               ? (1 + (UTIME_NOW == BILLION + 1)
+                                  + (UTIME_OMIT == BILLION + 1))
+                               : 0),
+  UTIME_BOGUS_NEG = -1 - ((UTIME_NOW == -1 || UTIME_OMIT == -1)
+                          ? (1 + (UTIME_NOW == -2) + (UTIME_OMIT == -2))
+                          : 0)
+};
+
+# if defined _WIN32 && !defined __CYGWIN__
+/* Skip ctime tests on native Windows, since it is either a copy of
+   mtime or birth time (depending on the file system), rather than a
+   properly tracked change time.  See
+   <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/stat-functions>.  */
+#  define check_ctime 0
+# elif defined __APPLE__ && defined __MACH__
+/* On macOS, the ctime is not updated when only the st_atime changes.  */
+#  define check_ctime -1
+# else
+#  define check_ctime 1
+# endif
+
+/* Compare two st_ctime values.  Return -1, 0 or 1, respectively
+   when A's st_ctime is smaller than, equal to or greater than B's.  */
+static int
+ctime_compare (struct stat const *a, struct stat const *b)
+{
+  if (a->st_ctime < b->st_ctime)
+    return -1;
+  else if (b->st_ctime < a->st_ctime)
+    return 1;
+  else if (get_stat_ctime_ns (a) < get_stat_ctime_ns (b))
+    return -1;
+  else if (get_stat_ctime_ns (b) < get_stat_ctime_ns (a))
+    return 1;
+  else
+    return 0;
+}
+
+#endif /* GL_TEST_UTIMENS_COMMON */