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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 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 (TIME_WITH_SYS_TIME)
+# include <sys/time.h>
+# include <time.h>
+#else
+# if defined (HAVE_SYS_TIME_H)
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+
+#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 */
+
+#endif /* _POSIXTIME_H_ */