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diff --git a/src/libopts/parse-duration.h b/src/libopts/parse-duration.h
deleted file mode 100644
index 9a7bcd5e10..0000000000
--- a/src/libopts/parse-duration.h
+++ /dev/null
@@ -1,90 +0,0 @@
-/* Parse a time duration and return a seconds count
-   Copyright (C) 2008-2018 Free Software Foundation, Inc.
-   Written by Bruce Korb <bkorb@gnu.org>, 2008.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
-
-/*
-
-  Readers and users of this function are referred to the ISO-8601
-  specification, with particular attention to "Durations".
-
-  At the time of writing, this worked:
-
-  https://en.wikipedia.org/wiki/ISO_8601#Durations
-
-  The string must start with a 'P', 'T' or a digit.
-
-  ==== if it is a digit
-
-  the string may contain:  NNN Y NNN M NNN W NNN d NNN h NNN m NNN s
-  This represents NNN years, NNN months, NNN weeks, NNN days, NNN hours,
-    NNN minutes and NNN seconds.
-  The embedded white space is optional.
-  These terms must appear in this order.
-  Case is significant:  'M' is months and 'm' is minutes.
-  The final "s" is optional.
-  All of the terms ("NNN" plus designator) are optional.
-  Minutes and seconds may optionally be represented as NNN:NNN.
-  Also, hours, minute and seconds may be represented as NNN:NNN:NNN.
-  There is no limitation on the value of any of the terms, except
-  that the final result must fit in a time_t value.
-
-  ==== if it is a 'P' or 'T', please see ISO-8601 for a rigorous definition.
-
-  The 'P' term may be followed by any of three formats:
-    yyyymmdd
-    yy-mm-dd
-    yy Y mm M ww W dd D
-
-  or it may be empty and followed by a 'T'.  The "yyyymmdd" must be eight
-  digits long.
-
-  NOTE!  Months are always 30 days and years are always 365 days long.
-  5 years is always 1825 days, not 1826 or 1827 depending on leap year
-  considerations.  3 months is always 90 days.  There is no consideration
-  for how many days are in the current, next or previous months.
-
-  For the final format:
-  *  Embedded white space is allowed, but it is optional.
-  *  All of the terms are optional.  Any or all-but-one may be omitted.
-  *  The meanings are yy years, mm months, ww weeks and dd days.
-  *  The terms must appear in this order.
-
-  ==== The 'T' term may be followed by any of these formats:
-
-    hhmmss
-    hh:mm:ss
-    hh H mm M ss S
-
-  For the final format:
-  *  Embedded white space is allowed, but it is optional.
-  *  All of the terms are optional.  Any or all-but-one may be omitted.
-  *  The terms must appear in this order.
-
- */
-#ifndef GNULIB_PARSE_DURATION_H
-#define GNULIB_PARSE_DURATION_H
-
-#include <time.h>
-
-/* Return value when a valid duration cannot be parsed.  */
-#define BAD_TIME        ((time_t)~0)
-
-/* Parses the given string.  If it has the syntax of a valid duration,
-   this duration is returned.  Otherwise, the return value is BAD_TIME,
-   and errno is set to either EINVAL (bad syntax) or ERANGE (out of range).  */
-extern time_t parse_duration (char const * in_pz);
-
-#endif /* GNULIB_PARSE_DURATION_H */