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diff --git a/include/posixtime.h b/include/posixtime.h
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+/* posixtime.h -- wrapper for time.h, sys/times.h mess. */
+
+/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash 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.
+
+ Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _POSIXTIME_H_
+#define _POSIXTIME_H_
+
+/* include this after config.h */
+/* Some systems require this, mostly for the definition of `struct timezone'.
+ For example, Dynix/ptx has that definition in <time.h> rather than
+ sys/time.h */
+#if defined (HAVE_SYS_TIME_H)
+# include <sys/time.h>
+#endif
+#include <time.h>
+
+#if !defined (HAVE_SYSCONF) || !defined (_SC_CLK_TCK)
+# if !defined (CLK_TCK)
+# if defined (HZ)
+# define CLK_TCK HZ
+# else
+# define CLK_TCK 60 /* 60HZ */
+# endif
+# endif /* !CLK_TCK */
+#endif /* !HAVE_SYSCONF && !_SC_CLK_TCK */
+
+#if !HAVE_TIMEVAL
+struct timeval
+{
+ time_t tv_sec;
+ long int tv_usec;
+};
+#endif
+
+#if !HAVE_GETTIMEOFDAY
+extern int gettimeofday PARAMS((struct timeval *, void *));
+#endif
+
+/* These exist on BSD systems, at least. */
+#if !defined (timerclear)
+# define timerclear(tvp) do { (tvp)->tv_sec = 0; (tvp)->tv_usec = 0; } while (0)
+#endif
+#if !defined (timerisset)
+# define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
+#endif
+#if !defined (timercmp)
+# define timercmp(a, b, CMP) \
+ (((a)->tv_sec == (b)->tv_sec) ? ((a)->tv_usec CMP (b)->tv_usec) \
+ : ((a)->tv_sec CMP (b)->tv_sec))
+#endif
+
+/* These are non-standard. */
+#if !defined (timerisunset)
+# define timerisunset(tvp) ((tvp)->tv_sec == 0 && (tvp)->tv_usec == 0)
+#endif
+#if !defined (timerset)
+# define timerset(tvp, s, u) do { tvp->tv_sec = s; tvp->tv_usec = u; } while (0)
+#endif
+
+#ifndef TIMEVAL_TO_TIMESPEC
+# define TIMEVAL_TO_TIMESPEC(tv, ts) \
+ do { \
+ (ts)->tv_sec = (tv)->tv_sec; \
+ (ts)->tv_nsec = (tv)->tv_usec * 1000; \
+ } while (0)
+#endif
+
+#endif /* _POSIXTIME_H_ */