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diff --git a/lib/gethrxtime.h b/lib/gethrxtime.h
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+/* gethrxtime -- get high resolution real time
+
+ Copyright (C) 2005, 2009-2020 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/>. */
+
+/* Written by Paul Eggert. */
+
+#ifndef GETHRXTIME_H_
+#define GETHRXTIME_H_ 1
+
+#include "xtime.h"
+
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
+_GL_INLINE_HEADER_BEGIN
+#ifndef GETHRXTIME_INLINE
+# define GETHRXTIME_INLINE _GL_INLINE
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Get the current time, as a count of the number of nanoseconds since
+ an arbitrary epoch (e.g., the system boot time). Prefer a
+ high-resolution clock that is not subject to resetting or
+ drifting. */
+
+#if HAVE_ARITHMETIC_HRTIME_T && HAVE_DECL_GETHRTIME
+# include <time.h>
+GETHRXTIME_INLINE xtime_t gethrxtime (void) { return gethrtime (); }
+# else
+xtime_t gethrxtime (void);
+#endif
+
+_GL_INLINE_HEADER_END
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif