Adding upstream version 2024a.upstream/2024aupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1361 insertions, 0 deletions

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+# Make and install tzdb code and data.
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+# Request POSIX conformance; this must be the first non-comment line.
+.POSIX:
+# On older platforms you may need to scrounge for a POSIX-conforming 'make'.
+# For example, on Solaris 10 (2005), use /usr/sfw/bin/gmake or
+# /usr/xpg4/bin/make, not /usr/ccs/bin/make.
+
+# To affect how this Makefile works, you can run a shell script like this:
+#
+#	#!/bin/sh
+#	make CC='gcc -std=gnu11' "$@"
+#
+# This example script is appropriate for a pre-2017 GNU/Linux system
+# where a non-default setting is needed to support this package's use of C99.
+#
+# Alternatively, you can simply edit this Makefile to tailor the following
+# macro definitions.
+
+###############################################################################
+# Start of macros that one plausibly might want to tailor.
+
+# Package name for the code distribution.
+PACKAGE=	tzcode
+
+# Version number for the distribution, overridden in the 'tarballs' rule below.
+VERSION=	unknown
+
+# Email address for bug reports.
+BUGEMAIL=	tz@iana.org
+
+# DATAFORM selects the data format.
+# Available formats represent essentially the same data, albeit
+# possibly with minor discrepancies that users are not likely to notice.
+# To get new features and the best data right away, use:
+#	DATAFORM=	vanguard
+# To wait a while before using new features, to give downstream users
+# time to upgrade zic (the default), use:
+#	DATAFORM=	main
+# To wait even longer for new features, use:
+#	DATAFORM=	rearguard
+# Rearguard users might also want "ZFLAGS = -b fat"; see below.
+DATAFORM=		main
+
+# Change the line below for your timezone (after finding the one you want in
+# one of the $(TDATA) source files, or adding it to a source file).
+# Alternatively, if you discover you've got the wrong timezone, you can just
+# 'zic -l -' to remove it, or 'zic -l rightzone' to change it.
+# Use the command
+#	make zonenames
+# to get a list of the values you can use for LOCALTIME.
+
+LOCALTIME=	Factory
+
+# The POSIXRULES macro controls interpretation of POSIX-2017.1-like TZ
+# settings like TZ='EET-2EEST' that lack DST transition rules.
+# If POSIXRULES is '-', no template is installed; this is the default.
+# Any other value for POSIXRULES is obsolete and should not be relied on, as:
+# * It does not work correctly in popular implementations such as GNU/Linux.
+# * It does not work even in tzcode, except for historical timestamps
+#   that precede the last explicit transition in the POSIXRULES file.
+#   Hence it typically does not work for current and future timestamps.
+# If, despite the above, you want a template for handling these settings,
+# you can change the line below (after finding the timezone you want in the
+# one of the $(TDATA) source files, or adding it to a source file).
+# Alternatively, if you discover you've got the wrong timezone, you can just
+# 'zic -p -' to remove it, or 'zic -p rightzone' to change it.
+# Use the command
+#	make zonenames
+# to get a list of the values you can use for POSIXRULES.
+
+POSIXRULES=	-
+
+# Also see TZDEFRULESTRING below, which takes effect only
+# if POSIXRULES is '-' or if the template file cannot be accessed.
+
+
+# Installation locations.
+#
+# The defaults are suitable for Debian, except that if REDO is
+# posix_right or right_posix then files that Debian puts under
+# /usr/share/zoneinfo/posix and /usr/share/zoneinfo/right are instead
+# put under /usr/share/zoneinfo-posix and /usr/share/zoneinfo-leaps,
+# respectively.  Problems with the Debian approach are discussed in
+# the commentary for the right_posix rule (below).
+
+# Destination directory, which can be used for staging.
+# 'make DESTDIR=/stage install' installs under /stage (e.g., to
+# /stage/etc/localtime instead of to /etc/localtime).  Files under
+# /stage are not intended to work as-is, but can be copied by hand to
+# the root directory later.  If DESTDIR is empty, 'make install' does
+# not stage, but installs directly into production locations.
+DESTDIR =
+
+# Everything is installed into subdirectories of TOPDIR, and used there.
+# TOPDIR should be empty (meaning the root directory),
+# or a directory name that does not end in "/".
+# TOPDIR should be empty or an absolute name unless you're just testing.
+TOPDIR =
+
+# The default local timezone is taken from the file TZDEFAULT.
+TZDEFAULT = $(TOPDIR)/etc/localtime
+
+# The subdirectory containing installed program and data files, and
+# likewise for installed files that can be shared among architectures.
+# These should be relative file names.
+USRDIR = usr
+USRSHAREDIR = $(USRDIR)/share
+
+# "Compiled" timezone information is placed in the "TZDIR" directory
+# (and subdirectories).
+# TZDIR_BASENAME should not contain "/" and should not be ".", ".." or empty.
+TZDIR_BASENAME=	zoneinfo
+TZDIR = $(TOPDIR)/$(USRSHAREDIR)/$(TZDIR_BASENAME)
+
+# The "tzselect" and (if you do "make INSTALL") "date" commands go in:
+BINDIR = $(TOPDIR)/$(USRDIR)/bin
+
+# The "zdump" command goes in:
+ZDUMPDIR = $(BINDIR)
+
+# The "zic" command goes in:
+ZICDIR = $(TOPDIR)/$(USRDIR)/sbin
+
+# Manual pages go in subdirectories of. . .
+MANDIR = $(TOPDIR)/$(USRSHAREDIR)/man
+
+# Library functions are put in an archive in LIBDIR.
+LIBDIR = $(TOPDIR)/$(USRDIR)/lib
+
+
+# Types to try, as an alternative to time_t.
+TIME_T_ALTERNATIVES = $(TIME_T_ALTERNATIVES_HEAD) $(TIME_T_ALTERNATIVES_TAIL)
+TIME_T_ALTERNATIVES_HEAD = int_least64_t
+TIME_T_ALTERNATIVES_TAIL = int_least32_t uint_least32_t uint_least64_t
+
+# What kind of TZif data files to generate.  (TZif is the binary time
+# zone data format that zic generates; see Internet RFC 8536.)
+# If you want only POSIX time, with time values interpreted as
+# seconds since the epoch (not counting leap seconds), use
+#	REDO=		posix_only
+# below.  If you want only "right" time, with values interpreted
+# as seconds since the epoch (counting leap seconds), use
+#	REDO=		right_only
+# below.  If you want both sets of data available, with leap seconds not
+# counted normally, use
+#	REDO=		posix_right
+# below.  If you want both sets of data available, with leap seconds counted
+# normally, use
+#	REDO=		right_posix
+# below.  POSIX mandates that leap seconds not be counted; for compatibility
+# with it, use "posix_only" or "posix_right".  Use POSIX time on systems with
+# leap smearing; this can work better than unsmeared "right" time with
+# applications that are not leap second aware, and is closer to unsmeared
+# "right" time than unsmeared POSIX time is (e.g., 0.5 vs 1.0 s max error).
+
+REDO=		posix_right
+
+# Whether to put an "Expires" line in the leapseconds file.
+# Use EXPIRES_LINE=1 to put the line in, 0 to omit it.
+# The EXPIRES_LINE value matters only if REDO's value contains "right".
+# If you change EXPIRES_LINE, remove the leapseconds file before running "make".
+# zic's support for the Expires line was introduced in tzdb 2020a,
+# and was modified in tzdb 2021b to generate version 4 TZif files.
+# EXPIRES_LINE defaults to 0 for now so that the leapseconds file
+# can be given to pre-2020a zic implementations and so that TZif files
+# built by newer zic implementations can be read by pre-2021b libraries.
+EXPIRES_LINE=	0
+
+# To install data in text form that has all the information of the TZif data,
+# (optionally incorporating leap second information), use
+#	TZDATA_TEXT=	tzdata.zi leapseconds
+# To install text data without leap second information (e.g., because
+# REDO='posix_only'), use
+#	TZDATA_TEXT=	tzdata.zi
+# To avoid installing text data, use
+#	TZDATA_TEXT=
+
+TZDATA_TEXT=	leapseconds tzdata.zi
+
+# For backward-compatibility links for old zone names, use
+#	BACKWARD=	backward
+# To omit these links, use
+#	BACKWARD=
+
+BACKWARD=	backward
+
+# If you want out-of-scope and often-wrong data from the file 'backzone',
+# but only for entries listed in the backward-compatibility file zone.tab, use
+#	PACKRATDATA=	backzone
+#	PACKRATLIST=	zone.tab
+# If you want all the 'backzone' data, use
+#	PACKRATDATA=	backzone
+#	PACKRATLIST=
+# To omit this data, use
+#	PACKRATDATA=
+#	PACKRATLIST=
+
+PACKRATDATA=
+PACKRATLIST=
+
+# The name of a locale using the UTF-8 encoding, used during self-tests.
+# The tests are skipped if the name does not appear to work on this system.
+
+UTF8_LOCALE=	en_US.utf8
+
+# Non-default libraries needed to link.
+# On some hosts, this should have -lintl unless CFLAGS has -DHAVE_GETTEXT=0.
+LDLIBS=
+
+# Add the following to an uncommented "CFLAGS=" line as needed
+# to override defaults specified in the source code or by the system.
+# "-DFOO" is equivalent to "-DFOO=1".
+#  -DDEPRECATE_TWO_DIGIT_YEARS for optional runtime warnings about strftime
+#	formats that generate only the last two digits of year numbers
+#  -DEPOCH_LOCAL if the 'time' function returns local time not UT
+#  -DEPOCH_OFFSET=N if the 'time' function returns a value N greater
+#	than what POSIX specifies, assuming local time is UT.
+#	For example, N is 252460800 on AmigaOS.
+#  -DHAVE_DECL_ASCTIME_R=0 if <time.h> does not declare asctime_r
+#  -DHAVE_DECL_ENVIRON if <unistd.h> declares 'environ'
+#  -DHAVE_DECL_TIMEGM=0 if <time.h> does not declare timegm
+#  -DHAVE_DIRECT_H if mkdir needs <direct.h> (MS-Windows)
+#  -DHAVE__GENERIC=0 if _Generic does not work*
+#  -DHAVE_GETRANDOM if getrandom works (e.g., GNU/Linux),
+#	-DHAVE_GETRANDOM=0 to avoid using getrandom
+#  -DHAVE_GETTEXT if gettext works (e.g., GNU/Linux, FreeBSD, Solaris),
+#	where LDLIBS also needs to contain -lintl on some hosts;
+#	-DHAVE_GETTEXT=0 to avoid using gettext
+#  -DHAVE_INCOMPATIBLE_CTIME_R if your system's time.h declares
+#	ctime_r and asctime_r incompatibly with the POSIX standard
+#	(Solaris when _POSIX_PTHREAD_SEMANTICS is not defined).
+#  -DHAVE_INTTYPES_H=0 if <inttypes.h> does not work*+
+#  -DHAVE_LINK=0 if your system lacks a link function
+#  -DHAVE_LOCALTIME_R=0 if your system lacks a localtime_r function
+#  -DHAVE_LOCALTIME_RZ=0 if you do not want zdump to use localtime_rz
+#	localtime_rz can make zdump significantly faster, but is nonstandard.
+#  -DHAVE_MALLOC_ERRNO=0 if malloc etc. do not set errno on failure.
+#  -DHAVE_POSIX_DECLS=0 if your system's include files do not declare
+#	functions like 'link' or variables like 'tzname' required by POSIX
+#  -DHAVE_SETENV=0 if your system lacks the setenv function
+#  -DHAVE_SNPRINTF=0 if your system lacks the snprintf function+
+#  -DHAVE_STDCKDINT_H=0 if neither <stdckdint.h> nor substitutes like
+#	__builtin_add_overflow work*
+#  -DHAVE_STDINT_H=0 if <stdint.h> does not work*+
+#  -DHAVE_STRFTIME_L if <time.h> declares locale_t and strftime_l
+#  -DHAVE_STRDUP=0 if your system lacks the strdup function
+#  -DHAVE_STRTOLL=0 if your system lacks the strtoll function+
+#  -DHAVE_SYMLINK=0 if your system lacks the symlink function
+#  -DHAVE_SYS_STAT_H=0 if <sys/stat.h> does not work*
+#  -DHAVE_TZSET=0 if your system lacks a tzset function
+#  -DHAVE_UNISTD_H=0 if <unistd.h> does not work*
+#  -DHAVE_UTMPX_H=0 if <utmpx.h> does not work*
+#  -Dlocale_t=XXX if your system uses XXX instead of locale_t
+#  -DPORT_TO_C89 if tzcode should also run on mostly-C89 platforms+
+#	Typically it is better to use a later standard.  For example,
+#	with GCC 4.9.4 (2016), prefer '-std=gnu11' to '-DPORT_TO_C89'.
+#	Even with -DPORT_TO_C89, the code needs at least one C99
+#	feature (integers at least 64 bits wide) and maybe more.
+#  -DRESERVE_STD_EXT_IDS if your platform reserves standard identifiers
+#	with external linkage, e.g., applications cannot define 'localtime'.
+#  -Dssize_t=long on hosts like MS-Windows that lack ssize_t
+#  -DSUPPORT_C89 if the tzcode library should support C89 callers+
+#	However, this might trigger latent bugs in C99-or-later callers.
+#  -DSUPPRESS_TZDIR to not prepend TZDIR to file names; this has
+#	security implications and is not recommended for general use
+#  -DTHREAD_SAFE to make localtime.c thread-safe, as POSIX requires;
+#	not needed by the main-program tz code, which is single-threaded.
+#	Append other compiler flags as needed, e.g., -pthread on GNU/Linux.
+#  -Dtime_tz=\"T\" to use T as the time_t type, rather than the system time_t
+#	This is intended for internal use only; it mangles external names.
+#  -DTZ_DOMAIN=\"foo\" to use "foo" for gettext domain name; default is "tz"
+#  -DTZ_DOMAINDIR=\"/path\" to use "/path" for gettext directory;
+#	the default is system-supplied, typically "/usr/lib/locale"
+#  -DTZDEFRULESTRING=\",date/time,date/time\" to default to the specified
+#	DST transitions for POSIX.1-2017-style TZ strings lacking them,
+#	in the usual case where POSIXRULES is '-'.  If not specified,
+#	TZDEFRULESTRING defaults to US rules for future DST transitions.
+#	This mishandles some past timestamps, as US DST rules have changed.
+#	It also mishandles settings like TZ='EET-2EEST' for eastern Europe,
+#	as Europe and US DST rules differ.
+#  -DTZNAME_MAXIMUM=N to limit time zone abbreviations to N bytes (default 255)
+#  -DUNINIT_TRAP if reading uninitialized storage can cause problems
+#	other than simply getting garbage data
+#  -DUSE_LTZ=0 to build zdump with the system time zone library
+#	Also set TZDOBJS=zdump.o and CHECK_TIME_T_ALTERNATIVES= below.
+#  -DZIC_BLOAT_DEFAULT=\"fat\" to default zic's -b option to "fat", and
+#	similarly for "slim".  Fat TZif files work around incompatibilities
+#	and bugs in some TZif readers, notably older ones that
+#	ignore or otherwise mishandle 64-bit data in TZif files;
+#	however, fat TZif files may trigger bugs in newer TZif readers.
+#	Slim TZif files are more efficient, and are the default.
+#  -DZIC_MAX_ABBR_LEN_WO_WARN=3
+#	(or some other number) to set the maximum time zone abbreviation length
+#	that zic will accept without a warning (the default is 6)
+#  -g to generate symbolic debugging info
+#  -Idir to include from directory 'dir'
+#  -O0 to disable optimization; other -O options to enable more optimization
+#  -Uname to remove any definition of the macro 'name'
+#  $(GCC_DEBUG_FLAGS) if you are using recent GCC and want lots of checking
+#
+# * Options marked "*" can be omitted if your compiler is C23 compatible.
+# * Options marked "+" are obsolescent and are planned to be removed
+#   once the code assumes C99 or later, say in the year 2029.
+#
+# Select instrumentation via "make GCC_INSTRUMENT='whatever'".
+GCC_INSTRUMENT = \
+  -fsanitize=undefined -fsanitize-address-use-after-scope \
+  -fsanitize-undefined-trap-on-error -fstack-protector
+# Omit -fanalyzer from GCC_DEBUG_FLAGS, as it makes GCC too slow.
+GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
+  $(GCC_INSTRUMENT) \
+  -Wall -Wextra \
+  -Walloc-size-larger-than=100000 -Warray-bounds=2 \
+  -Wbad-function-cast -Wbidi-chars=any,ucn -Wcast-align=strict -Wdate-time \
+  -Wdeclaration-after-statement -Wdouble-promotion \
+  -Wduplicated-branches -Wduplicated-cond \
+  -Wformat=2 -Wformat-overflow=2 -Wformat-signedness -Wformat-truncation \
+  -Wimplicit-fallthrough=5 -Winit-self -Wlogical-op \
+  -Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
+  -Wnull-dereference \
+  -Wold-style-definition -Woverlength-strings -Wpointer-arith \
+  -Wshadow -Wshift-overflow=2 -Wstrict-overflow \
+  -Wstrict-prototypes -Wstringop-overflow=4 \
+  -Wstringop-truncation -Wsuggest-attribute=cold \
+  -Wsuggest-attribute=const -Wsuggest-attribute=format \
+  -Wsuggest-attribute=malloc \
+  -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure \
+  -Wtrampolines -Wundef -Wuninitialized -Wunused-macros -Wuse-after-free=3 \
+  -Wvariadic-macros -Wvla -Wwrite-strings \
+  -Wno-address -Wno-format-nonliteral -Wno-sign-compare \
+  -Wno-type-limits
+#
+# If your system has a "GMT offset" field in its "struct tm"s
+# (or if you decide to add such a field in your system's "time.h" file),
+# add the name to a define such as
+#	-DTM_GMTOFF=tm_gmtoff
+# to the end of the "CFLAGS=" line.  If not defined, the code attempts to
+# guess TM_GMTOFF from other macros; define NO_TM_GMTOFF to suppress this.
+# Similarly, if your system has a "zone abbreviation" field, define
+#	-DTM_ZONE=tm_zone
+# and define NO_TM_ZONE to suppress any guessing.
+# Although these two fields are not required by POSIX.1-2017,
+# POSIX 202x/D4 requires them and they are widely available
+# on GNU/Linux and BSD systems.
+#
+# The next batch of options control support for external variables
+# exported by tzcode.  In practice these variables are less useful
+# than TM_GMTOFF and TM_ZONE.  However, most of them are standardized.
+# #
+# # To omit or support the external variable "tzname", add one of:
+# #	-DHAVE_TZNAME=0 # do not support "tzname"
+# #	-DHAVE_TZNAME=1 # support "tzname", which is defined by system library
+# #	-DHAVE_TZNAME=2 # support and define "tzname"
+# # to the "CFLAGS=" line.  "tzname" is required by POSIX.1-1988 and later.
+# # If not defined, the code attempts to guess HAVE_TZNAME from other macros.
+# # Warning: unless time_tz is also defined, HAVE_TZNAME=1 can cause
+# # crashes when combined with some platforms' standard libraries,
+# # presumably due to memory allocation issues.
+# #
+# # To omit or support the external variables "timezone" and "daylight", add
+# #	-DUSG_COMPAT=0 # do not support
+# #	-DUSG_COMPAT=1 # support, and variables are defined by system library
+# #	-DUSG_COMPAT=2 # support and define variables
+# # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by Unix
+# # Systems Group code and are required by POSIX.1-2008 and later (with XSI).
+# # If not defined, the code attempts to guess USG_COMPAT from other macros.
+# #
+# # To support the external variable "altzone", add
+# #	-DALTZONE=0 # do not support
+# #	-DALTZONE=1 # support "altzone", which is defined by system library
+# #	-DALTZONE=2 # support and define "altzone"
+# # to the end of the "CFLAGS=" line; although "altzone" appeared in
+# # System V Release 3.1 it has not been standardized.
+# # If not defined, the code attempts to guess ALTZONE from other macros.
+#
+# If you want functions that were inspired by early versions of X3J11's work,
+# add
+#	-DSTD_INSPIRED
+# to the end of the "CFLAGS=" line.  This arranges for the following
+# functions to be added to the time conversion library.
+# "offtime" is like "gmtime" except that it accepts a second (long) argument
+# that gives an offset to add to the time_t when converting it.
+# I.e., "offtime" is like calling "localtime_rz" with a fixed-offset zone.
+# "timelocal" is nearly equivalent to "mktime".
+# "timeoff" is like "timegm" except that it accepts a second (long) argument
+# that gives an offset to use when converting to a time_t.
+# I.e., "timeoff" is like calling "mktime_z" with a fixed-offset zone.
+# "posix2time" and "time2posix" are described in an included manual page.
+# X3J11's work does not describe any of these functions.
+# These functions may well disappear in future releases of the time
+# conversion package.
+#
+# If you don't want functions that were inspired by NetBSD, add
+#	-DNETBSD_INSPIRED=0
+# to the end of the "CFLAGS=" line.  Otherwise, the functions
+# "localtime_rz", "mktime_z", "tzalloc", and "tzfree" are added to the
+# time library, and if STD_INSPIRED is also defined to nonzero the functions
+# "posix2time_z" and "time2posix_z" are added as well.
+# The functions ending in "_z" (or "_rz") are like their unsuffixed
+# (or suffixed-by-"_r") counterparts, except with an extra first
+# argument of opaque type timezone_t that specifies the timezone.
+# "tzalloc" allocates a timezone_t value, and "tzfree" frees it.
+#
+# If you want to allocate state structures in localtime, add
+#	-DALL_STATE
+# to the end of the "CFLAGS=" line.  Storage is obtained by calling malloc.
+#
+# NIST-PCTS:151-2, Version 1.4, (1993-12-03) is a test suite put
+# out by the National Institute of Standards and Technology
+# which claims to test C and POSIX conformance.  If you want to pass PCTS, add
+#	-DPCTS
+# to the end of the "CFLAGS=" line.
+#
+# If you want strict compliance with XPG4 as of 1994-04-09, add
+#	-DXPG4_1994_04_09
+# to the end of the "CFLAGS=" line.  This causes "strftime" to always return
+# 53 as a week number (rather than 52 or 53) for January days before
+# January's first Monday when a "%V" format is used and January 1
+# falls on a Friday, Saturday, or Sunday.
+#
+# POSIX says CFLAGS defaults to "-O 1".
+# Uncomment the following line and edit its contents as needed.
+
+#CFLAGS= -O 1
+
+
+# The name of a POSIX-like library archiver, its flags, C compiler,
+# linker flags, and 'make' utility.  Ordinarily the defaults suffice.
+# The commented-out values are the defaults specified by POSIX.1-202x/D4.
+#AR = ar
+#ARFLAGS = -rv
+#CC = c17
+#LDFLAGS =
+#MAKE = make
+
+# For leap seconds, this Makefile uses LEAPSECONDS='-L leapseconds' in
+# submake command lines.  The default is no leap seconds.
+
+LEAPSECONDS=
+
+# Where to fetch leap-seconds.list from.
+leaplist_URI = \
+  https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list
+# The file is generated by the IERS Earth Orientation Centre, in Paris.
+leaplist_TZ = Europe/Paris
+
+# The zic command and its arguments.
+
+zic=		./zic
+ZIC=		$(zic) $(ZFLAGS)
+
+# To shrink the size of installed TZif files,
+# append "-r @N" to omit data before N-seconds-after-the-Epoch.
+# To grow the files and work around bugs in older applications,
+# possibly at the expense of introducing bugs in newer ones,
+# append "-b fat"; see ZIC_BLOAT_DEFAULT above.
+# See the zic man page for more about -b and -r.
+ZFLAGS=
+
+# How to use zic to install TZif files.
+
+ZIC_INSTALL=	$(ZIC) -d '$(DESTDIR)$(TZDIR)' $(LEAPSECONDS)
+
+# The name of a POSIX-compliant 'awk' on your system.
+# mawk 1.3.3 and Solaris 10 /usr/bin/awk do not work.
+# Also, it is better (though not essential) if 'awk' supports UTF-8,
+# and unfortunately mawk and busybox awk do not support UTF-8.
+# Try AWK=gawk or AWK=nawk if your awk has the abovementioned problems.
+AWK=		awk
+
+# The full path name of a POSIX-compliant shell, preferably one that supports
+# the Korn shell's 'select' statement as an extension.
+# These days, Bash is the most popular.
+# It should be OK to set this to /bin/sh, on platforms where /bin/sh
+# lacks 'select' or doesn't completely conform to POSIX, but /bin/bash
+# is typically nicer if it works.
+KSHELL=		/bin/bash
+
+# Name of curl <https://curl.haxx.se/>, used for HTML validation
+# and to fetch leap-seconds.list from upstream.
+CURL=		curl
+
+# Name of GNU Privacy Guard <https://gnupg.org/>, used to sign distributions.
+GPG=		gpg
+
+# This expensive test requires USE_LTZ.
+# To suppress it, define this macro to be empty.
+CHECK_TIME_T_ALTERNATIVES = check_time_t_alternatives
+
+# SAFE_CHAR is a regular expression that matches a safe character.
+# Some parts of this distribution are limited to safe characters;
+# others can use any UTF-8 character.
+# For now, the safe characters are a safe subset of ASCII.
+# The caller must set the shell variable 'sharp' to the character '#',
+# since Makefile macros cannot contain '#'.
+# TAB_CHAR is a single tab character, in single quotes.
+TAB_CHAR=	'	'
+SAFE_CHARSET1=	$(TAB_CHAR)' !\"'$$sharp'$$%&'\''()*+,./0123456789:;<=>?@'
+SAFE_CHARSET2=	'ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\^_`'
+SAFE_CHARSET3=	'abcdefghijklmnopqrstuvwxyz{|}~'
+SAFE_CHARSET=	$(SAFE_CHARSET1)$(SAFE_CHARSET2)$(SAFE_CHARSET3)
+SAFE_CHAR=	'[]'$(SAFE_CHARSET)'-]'
+
+# These non-alphabetic, non-ASCII printable characters are Latin-1,
+# and so are likely displayable even in editors like XEmacs 21
+# that have limited display capabilities.
+UNUSUAL_OK_LATIN_1 = ¡¢£¤¥¦§¨©«¬®¯°±²³´¶·¸¹»¼½¾¿×÷
+# Non-ASCII non-letters that OK_CHAR allows, as these characters are
+# useful in commentary.
+UNUSUAL_OK_CHARSET= $(UNUSUAL_OK_LATIN_1)
+
+# Put this in a bracket expression to match spaces.
+s = [:space:]
+
+# OK_CHAR matches any character allowed in the distributed files.
+# This is the same as SAFE_CHAR, except that UNUSUAL_OK_CHARSET and
+# multibyte letters are also allowed so that commentary can contain a
+# few safe symbols and people's names and can quote non-English sources.
+# Other non-letters are limited to ASCII renderings for the
+# convenience of maintainers using XEmacs 21.5.34, which by default
+# mishandles Unicode characters U+0100 and greater.
+OK_CHAR=	'[][:alpha:]$(UNUSUAL_OK_CHARSET)'$(SAFE_CHARSET)'-]'
+
+# SAFE_LINE matches a line of safe characters.
+# SAFE_SHARP_LINE is similar, except any OK character can follow '#';
+# this is so that comments can contain non-ASCII characters.
+# OK_LINE matches a line of OK characters.
+SAFE_LINE=	'^'$(SAFE_CHAR)'*$$'
+SAFE_SHARP_LINE='^'$(SAFE_CHAR)'*('$$sharp$(OK_CHAR)'*)?$$'
+OK_LINE=	'^'$(OK_CHAR)'*$$'
+
+# Flags to give 'tar' when making a distribution.
+# Try to use flags appropriate for GNU tar.
+GNUTARFLAGS= --format=pax --pax-option='delete=atime,delete=ctime' \
+  --numeric-owner --owner=0 --group=0 \
+  --mode=go+u,go-w --sort=name
+TARFLAGS=	`if tar $(GNUTARFLAGS) --version >/dev/null 2>&1; \
+		 then echo $(GNUTARFLAGS); \
+		 else :; \
+		 fi`
+
+# Flags to give 'gzip' when making a distribution.
+GZIPFLAGS=	-9n
+
+# When comparing .tzs files, use GNU diff's -F'^TZ=' option if supported.
+# This makes it easier to see which Zone has been affected.
+DIFF_TZS=	 diff -u$$(! diff -u -F'^TZ=' - - <>/dev/null >&0 2>&1 \
+			   || echo ' -F^TZ=')
+
+# ':' on typical hosts; 'ranlib' on the ancient hosts that still need ranlib.
+RANLIB=		:
+
+# POSIX prohibits defining or using SHELL.  However, csh users on systems
+# that use the user shell for Makefile commands may need to define SHELL.
+#SHELL=		/bin/sh
+
+# End of macros that one plausibly might want to tailor.
+###############################################################################
+
+
+TZCOBJS=	zic.o
+TZDOBJS=	zdump.o localtime.o asctime.o strftime.o
+DATEOBJS=	date.o localtime.o strftime.o asctime.o
+LIBSRCS=	localtime.c asctime.c difftime.c strftime.c
+LIBOBJS=	localtime.o asctime.o difftime.o strftime.o
+HEADERS=	tzfile.h private.h
+NONLIBSRCS=	zic.c zdump.c
+NEWUCBSRCS=	date.c
+SOURCES=	$(HEADERS) $(LIBSRCS) $(NONLIBSRCS) $(NEWUCBSRCS) \
+			tzselect.ksh workman.sh
+MANS=		newctime.3 newstrftime.3 newtzset.3 time2posix.3 \
+			tzfile.5 tzselect.8 zic.8 zdump.8
+MANTXTS=	newctime.3.txt newstrftime.3.txt newtzset.3.txt \
+			time2posix.3.txt \
+			tzfile.5.txt tzselect.8.txt zic.8.txt zdump.8.txt \
+			date.1.txt
+COMMON=		calendars CONTRIBUTING LICENSE Makefile \
+			NEWS README SECURITY theory.html version
+WEB_PAGES=	tz-art.html tz-how-to.html tz-link.html
+CHECK_WEB_PAGES=check_theory.html check_tz-art.html \
+			check_tz-how-to.html check_tz-link.html
+DOCS=		$(MANS) date.1 $(MANTXTS) $(WEB_PAGES)
+PRIMARY_YDATA=	africa antarctica asia australasia \
+		europe northamerica southamerica
+YDATA=		$(PRIMARY_YDATA) etcetera
+NDATA=		factory
+TDATA_TO_CHECK=	$(YDATA) $(NDATA) backward
+TDATA=		$(YDATA) $(NDATA) $(BACKWARD)
+ZONETABLES=	zone.tab zone1970.tab zonenow.tab
+TABDATA=	iso3166.tab $(TZDATA_TEXT) $(ZONETABLES)
+LEAP_DEPS=	leapseconds.awk leap-seconds.list
+TZDATA_ZI_DEPS=	ziguard.awk zishrink.awk version $(TDATA) \
+		  $(PACKRATDATA) $(PACKRATLIST)
+DSTDATA_ZI_DEPS= ziguard.awk $(TDATA) $(PACKRATDATA) $(PACKRATLIST)
+DATA=		$(TDATA_TO_CHECK) backzone iso3166.tab leap-seconds.list \
+			leapseconds $(ZONETABLES)
+AWK_SCRIPTS=	checklinks.awk checknow.awk checktab.awk leapseconds.awk \
+			ziguard.awk zishrink.awk
+MISC=		$(AWK_SCRIPTS)
+TZS_YEAR=	2050
+TZS_CUTOFF_FLAG=	-c $(TZS_YEAR)
+TZS=		to$(TZS_YEAR).tzs
+TZS_NEW=	to$(TZS_YEAR)new.tzs
+TZS_DEPS=	$(YDATA) asctime.c localtime.c \
+			private.h tzfile.h zdump.c zic.c
+TZDATA_DIST = $(COMMON) $(DATA) $(MISC)
+# EIGHT_YARDS is just a yard short of the whole ENCHILADA.
+EIGHT_YARDS = $(TZDATA_DIST) $(DOCS) $(SOURCES) tzdata.zi
+ENCHILADA = $(EIGHT_YARDS) $(TZS)
+
+# Consult these files when deciding whether to rebuild the 'version' file.
+# This list is not the same as the output of 'git ls-files', since
+# .gitignore is not distributed.
+VERSION_DEPS= \
+		calendars CONTRIBUTING LICENSE Makefile NEWS README SECURITY \
+		africa antarctica asctime.c asia australasia \
+		backward backzone \
+		checklinks.awk checknow.awk checktab.awk \
+		date.1 date.c difftime.c \
+		etcetera europe factory iso3166.tab \
+		leap-seconds.list leapseconds.awk localtime.c \
+		newctime.3 newstrftime.3 newtzset.3 northamerica \
+		private.h southamerica strftime.c theory.html \
+		time2posix.3 tz-art.html tz-how-to.html tz-link.html \
+		tzfile.5 tzfile.h tzselect.8 tzselect.ksh \
+		workman.sh zdump.8 zdump.c zic.8 zic.c \
+		ziguard.awk zishrink.awk \
+		zone.tab zone1970.tab zonenow.tab
+
+all:		tzselect zic zdump libtz.a $(TABDATA) \
+		  vanguard.zi main.zi rearguard.zi
+
+ALL:		all date $(ENCHILADA)
+
+install:	all $(DATA) $(REDO) $(MANS)
+		mkdir -p '$(DESTDIR)$(BINDIR)' \
+			'$(DESTDIR)$(ZDUMPDIR)' '$(DESTDIR)$(ZICDIR)' \
+			'$(DESTDIR)$(LIBDIR)' \
+			'$(DESTDIR)$(MANDIR)/man3' '$(DESTDIR)$(MANDIR)/man5' \
+			'$(DESTDIR)$(MANDIR)/man8'
+		$(ZIC_INSTALL) -l $(LOCALTIME) \
+			`case '$(POSIXRULES)' in ?*) echo '-p';; esac \
+			` $(POSIXRULES) \
+			-t '$(DESTDIR)$(TZDEFAULT)'
+		cp -f $(TABDATA) '$(DESTDIR)$(TZDIR)/.'
+		cp tzselect '$(DESTDIR)$(BINDIR)/.'
+		cp zdump '$(DESTDIR)$(ZDUMPDIR)/.'
+		cp zic '$(DESTDIR)$(ZICDIR)/.'
+		cp libtz.a '$(DESTDIR)$(LIBDIR)/.'
+		$(RANLIB) '$(DESTDIR)$(LIBDIR)/libtz.a'
+		cp -f newctime.3 newtzset.3 '$(DESTDIR)$(MANDIR)/man3/.'
+		cp -f tzfile.5 '$(DESTDIR)$(MANDIR)/man5/.'
+		cp -f tzselect.8 zdump.8 zic.8 '$(DESTDIR)$(MANDIR)/man8/.'
+
+INSTALL:	ALL install date.1
+		mkdir -p '$(DESTDIR)$(BINDIR)' '$(DESTDIR)$(MANDIR)/man1'
+		cp date '$(DESTDIR)$(BINDIR)/.'
+		cp -f date.1 '$(DESTDIR)$(MANDIR)/man1/.'
+
+# Calculate version number from git, if available.
+# Otherwise, use $(VERSION) unless it is "unknown" and there is already
+# a 'version' file, in which case reuse the existing 'version' contents
+# and append "-dirty" if the contents do not already end in "-dirty".
+version:	$(VERSION_DEPS)
+		{ (type git) >/dev/null 2>&1 && \
+		  V=`git describe --match '[0-9][0-9][0-9][0-9][a-z]*' \
+				--abbrev=7 --dirty` || \
+		  if test '$(VERSION)' = unknown && V=`cat $@`; then \
+		    case $$V in *-dirty);; *) V=$$V-dirty;; esac; \
+		  else \
+		    V='$(VERSION)'; \
+		  fi; } && \
+		printf '%s\n' "$$V" >$@.out
+		mv $@.out $@
+
+# These files can be tailored by setting BACKWARD, PACKRATDATA, PACKRATLIST.
+vanguard.zi main.zi rearguard.zi: $(DSTDATA_ZI_DEPS)
+		$(AWK) \
+		  -v DATAFORM=`expr $@ : '\(.*\).zi'` \
+		  -v PACKRATDATA='$(PACKRATDATA)' \
+		  -v PACKRATLIST='$(PACKRATLIST)' \
+		  -f ziguard.awk \
+		  $(TDATA) $(PACKRATDATA) >$@.out
+		mv $@.out $@
+# This file has a version comment that attempts to capture any tailoring
+# via BACKWARD, DATAFORM, PACKRATDATA, PACKRATLIST, and REDO.
+tzdata.zi:	$(DATAFORM).zi version zishrink.awk
+		version=`sed 1q version` && \
+		  LC_ALL=C $(AWK) \
+		    -v dataform='$(DATAFORM)' \
+		    -v deps='$(DSTDATA_ZI_DEPS) zishrink.awk' \
+		    -v redo='$(REDO)' \
+		    -v version="$$version" \
+		    -f zishrink.awk \
+		    $(DATAFORM).zi >$@.out
+		mv $@.out $@
+
+tzdir.h:
+		printf '%s\n' >$@.out \
+		  '#ifndef TZDEFAULT' \
+		  '# define TZDEFAULT "$(TZDEFAULT)" /* default zone */' \
+		  '#endif' \
+		  '#ifndef TZDIR' \
+		  '# define TZDIR "$(TZDIR)" /* TZif directory */' \
+		  '#endif'
+		mv $@.out $@
+
+version.h:	version
+		VERSION=`cat version` && printf '%s\n' \
+		  'static char const PKGVERSION[]="($(PACKAGE)) ";' \
+		  "static char const TZVERSION[]=\"$$VERSION\";" \
+		  'static char const REPORT_BUGS_TO[]="$(BUGEMAIL)";' \
+		  >$@.out
+		mv $@.out $@
+
+zdump:		$(TZDOBJS)
+		$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(TZDOBJS) $(LDLIBS)
+
+zic:		$(TZCOBJS)
+		$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(TZCOBJS) $(LDLIBS)
+
+leapseconds:	$(LEAP_DEPS)
+		$(AWK) -v EXPIRES_LINE=$(EXPIRES_LINE) \
+		  -f leapseconds.awk leap-seconds.list >$@.out
+		mv $@.out $@
+
+# Awk script to extract a Git-style author from leap-seconds.list comments.
+EXTRACT_AUTHOR = \
+  author_line { sub(/^.[[:space:]]*/, ""); \
+      sub(/:[[:space:]]*/, " <"); \
+      printf "%s>\n", $$0; \
+      success = 1; \
+      exit \
+  } \
+  /Questions or comments to:/ { author_line = 1 } \
+  END { exit !success }
+
+# Fetch leap-seconds.list from upstream.
+fetch-leap-seconds.list:
+		$(CURL) -OR $(leaplist_URI)
+
+# Fetch leap-seconds.list from upstream and commit it to the local repository.
+commit-leap-seconds.list: fetch-leap-seconds.list
+		author=$$($(AWK) '$(EXTRACT_AUTHOR)' leap-seconds.list) && \
+		date=$$(TZ=$(leaplist_TZ) stat -c%y leap-seconds.list) && \
+		git commit --author="$$author" --date="$$date" -m'make $@' \
+		  leap-seconds.list
+
+# Arguments to pass to submakes of install_data.
+# They can be overridden by later submake arguments.
+INSTALLARGS = \
+ BACKWARD='$(BACKWARD)' \
+ DESTDIR='$(DESTDIR)' \
+ LEAPSECONDS='$(LEAPSECONDS)' \
+ PACKRATDATA='$(PACKRATDATA)' \
+ PACKRATLIST='$(PACKRATLIST)' \
+ TZDEFAULT='$(TZDEFAULT)' \
+ TZDIR='$(TZDIR)' \
+ ZIC='$(ZIC)'
+
+INSTALL_DATA_DEPS = zic leapseconds tzdata.zi
+
+# 'make install_data' installs one set of TZif files.
+install_data: $(INSTALL_DATA_DEPS)
+		$(ZIC_INSTALL) tzdata.zi
+
+posix_only: $(INSTALL_DATA_DEPS)
+		$(MAKE) $(INSTALLARGS) LEAPSECONDS= install_data
+
+right_only: $(INSTALL_DATA_DEPS)
+		$(MAKE) $(INSTALLARGS) LEAPSECONDS='-L leapseconds' \
+			install_data
+
+# In earlier versions of this makefile, the other two directories were
+# subdirectories of $(TZDIR).  However, this led to configuration errors.
+# For example, with posix_right under the earlier scheme,
+# TZ='right/Australia/Adelaide' got you localtime with leap seconds,
+# but gmtime without leap seconds, which led to problems with applications
+# like sendmail that subtract gmtime from localtime.
+# Therefore, the other two directories are now siblings of $(TZDIR).
+# You must replace all of $(TZDIR) to switch from not using leap seconds
+# to using them, or vice versa.
+right_posix:	right_only
+		rm -fr '$(DESTDIR)$(TZDIR)-leaps'
+		ln -s '$(TZDIR_BASENAME)' '$(DESTDIR)$(TZDIR)-leaps' || \
+		  $(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-leaps' right_only
+		$(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-posix' posix_only
+
+posix_right:	posix_only
+		rm -fr '$(DESTDIR)$(TZDIR)-posix'
+		ln -s '$(TZDIR_BASENAME)' '$(DESTDIR)$(TZDIR)-posix' || \
+		  $(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-posix' posix_only
+		$(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-leaps' right_only
+
+zones:		$(REDO)
+
+# dummy.zd is not a real file; it is mentioned here only so that the
+# top-level 'make' does not have a syntax error.
+ZDS = dummy.zd
+# Rule used only by submakes invoked by the $(TZS_NEW) rule.
+# It is separate so that GNU 'make -j' can run instances in parallel.
+$(ZDS): zdump
+		./zdump -i $(TZS_CUTOFF_FLAG) '$(wd)/'$$(expr $@ : '\(.*\).zd') \
+		  >$@
+
+TZS_NEW_DEPS = tzdata.zi zdump zic
+$(TZS_NEW): $(TZS_NEW_DEPS)
+		rm -fr tzs$(TZS_YEAR).dir
+		mkdir tzs$(TZS_YEAR).dir
+		$(zic) -d tzs$(TZS_YEAR).dir tzdata.zi
+		$(AWK) '/^L/{print "Link\t" $$2 "\t" $$3}' \
+		   tzdata.zi | LC_ALL=C sort >$@.out
+		wd=`pwd` && \
+		x=`$(AWK) '/^Z/{print "tzs$(TZS_YEAR).dir/" $$2 ".zd"}' \
+				tzdata.zi \
+			| LC_ALL=C sort -t . -k 2,2` && \
+		set x $$x && \
+		shift && \
+		ZDS=$$* && \
+		$(MAKE) wd="$$wd" TZS_CUTOFF_FLAG="$(TZS_CUTOFF_FLAG)" \
+		  ZDS="$$ZDS" $$ZDS && \
+		sed 's,^TZ=".*\.dir/,TZ=",' $$ZDS >>$@.out
+		rm -fr tzs$(TZS_YEAR).dir
+		mv $@.out $@
+
+# If $(TZS) exists but 'make check_tzs' fails, a maintainer should inspect the
+# failed output and fix the inconsistency, perhaps by running 'make force_tzs'.
+$(TZS):
+		touch $@
+
+force_tzs:	$(TZS_NEW)
+		cp $(TZS_NEW) $(TZS)
+
+libtz.a:	$(LIBOBJS)
+		rm -f $@
+		$(AR) $(ARFLAGS) $@ $(LIBOBJS)
+		$(RANLIB) $@
+
+date:		$(DATEOBJS)
+		$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(DATEOBJS) $(LDLIBS)
+
+tzselect:	tzselect.ksh version
+		VERSION=`cat version` && sed \
+		  -e "s'#!/bin/bash'#!"'$(KSHELL)'\' \
+		  -e s\''\(AWK\)=[^}]*'\''\1=\'\''$(AWK)\'\'\' \
+		  -e s\''\(PKGVERSION\)=.*'\''\1=\'\''($(PACKAGE)) \'\'\' \
+		  -e s\''\(REPORT_BUGS_TO\)=.*'\''\1=\'\''$(BUGEMAIL)\'\'\' \
+		  -e s\''\(TZDIR\)=[^}]*'\''\1=\'\''$(TZDIR)\'\'\' \
+		  -e s\''\(TZVERSION\)=.*'\''\1=\'"'$$VERSION\\''" \
+		  <$@.ksh >$@.out
+		chmod +x $@.out
+		mv $@.out $@
+
+check: check_back check_mild
+check_mild:	check_character_set check_white_space check_links \
+		  check_name_lengths check_now \
+		  check_slashed_abbrs check_sorted \
+		  check_tables check_web check_ziguard check_zishrink check_tzs
+
+# True if UTF8_LOCALE does not work;
+# otherwise, false but with LC_ALL set to $(UTF8_LOCALE).
+UTF8_LOCALE_MISSING = \
+  { test ! '$(UTF8_LOCALE)' \
+    || ! printf 'A\304\200B\n' \
+         | LC_ALL='$(UTF8_LOCALE)' grep -q '^A.B$$' >/dev/null 2>&1 \
+    || { LC_ALL='$(UTF8_LOCALE)'; export LC_ALL; false; }; }
+
+check_character_set: $(ENCHILADA)
+	$(UTF8_LOCALE_MISSING) || { \
+		sharp='#' && \
+		! grep -Env $(SAFE_LINE) $(MANS) date.1 $(MANTXTS) \
+			$(MISC) $(SOURCES) $(WEB_PAGES) \
+			CONTRIBUTING LICENSE README SECURITY \
+			version tzdata.zi && \
+		! grep -Env $(SAFE_LINE)'|^UNUSUAL_OK_'$(OK_CHAR)'*$$' \
+			Makefile && \
+		! grep -Env $(SAFE_SHARP_LINE) $(TDATA_TO_CHECK) backzone \
+			leapseconds zone.tab && \
+		! grep -Env $(OK_LINE) $(ENCHILADA); \
+	}
+	touch $@
+
+check_white_space: $(ENCHILADA)
+	$(UTF8_LOCALE_MISSING) || { \
+		patfmt=' \t|[\f\r\v]' && pat=`printf "$$patfmt\\n"` && \
+		! grep -En "$$pat|[$s]\$$" \
+			$$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list); \
+	}
+	touch $@
+
+PRECEDES_FILE_NAME = ^(Zone|Link[$s]+[^$s]+)[$s]+
+FILE_NAME_COMPONENT_TOO_LONG = $(PRECEDES_FILE_NAME)[^$s]*[^/$s]{15}
+
+check_name_lengths: $(TDATA_TO_CHECK) backzone
+		! grep -En '$(FILE_NAME_COMPONENT_TOO_LONG)' \
+			$(TDATA_TO_CHECK) backzone
+		touch $@
+
+PRECEDES_STDOFF = ^(Zone[$s]+[^$s]+)?[$s]+
+STDOFF = [-+]?[0-9:.]+
+RULELESS_SAVE = (-|$(STDOFF)[sd]?)
+RULELESS_SLASHED_ABBRS = \
+  $(PRECEDES_STDOFF)$(STDOFF)[$s]+$(RULELESS_SAVE)[$s]+[^$s]*/
+
+check_slashed_abbrs: $(TDATA_TO_CHECK)
+		! grep -En '$(RULELESS_SLASHED_ABBRS)' $(TDATA_TO_CHECK)
+		touch $@
+
+CHECK_CC_LIST = { n = split($$1,a,/,/); for (i=2; i<=n; i++) print a[1], a[i]; }
+
+check_sorted: backward backzone
+		$(AWK) '/^Link/ {printf "%.5d %s\n", g, $$3} !/./ {g++}' \
+		  backward | LC_ALL=C sort -cu
+		$(AWK) '/^Zone/ {print $$2}' backzone | LC_ALL=C sort -cu
+		touch $@
+
+check_back:	checklinks.awk $(TDATA_TO_CHECK)
+		$(AWK) \
+		  -v DATAFORM=$(DATAFORM) \
+		  -v backcheck=backward \
+		  -f checklinks.awk $(TDATA_TO_CHECK)
+		touch $@
+
+check_links:	checklinks.awk tzdata.zi
+		$(AWK) \
+		  -v DATAFORM=$(DATAFORM) \
+		  -f checklinks.awk tzdata.zi
+		touch $@
+
+# Check timestamps from now through 28 years from now, to make sure
+# that zonenow.tab contains all sequences of planned timestamps,
+# without any duplicate sequences.  In theory this might require
+# 2800 years but that would take a long time to check.
+CHECK_NOW_TIMESTAMP = `./date +%s`
+CHECK_NOW_FUTURE_YEARS = 28
+CHECK_NOW_FUTURE_SECS = $(CHECK_NOW_FUTURE_YEARS) '*' 366 '*' 24 '*' 60 '*' 60
+check_now:	checknow.awk date tzdata.zi zdump zic zone1970.tab zonenow.tab
+		rm -fr $@.dir
+		mkdir $@.dir
+		./zic -d $@.dir tzdata.zi
+		now=$(CHECK_NOW_TIMESTAMP) && \
+		  future=`expr $(CHECK_NOW_FUTURE_SECS) + $$now` && \
+		  ./zdump -i -t $$now,$$future \
+		     $$(find $$PWD/$@.dir/????*/ -type f) \
+		     >$@.dir/zdump.tab
+		$(AWK) \
+		  -v zdump_table=$@.dir/zdump.tab \
+		  -f checknow.awk zonenow.tab
+		rm -fr $@.dir
+		touch $@
+
+check_tables:	checktab.awk $(YDATA) backward zone.tab zone1970.tab
+		for tab in $(ZONETABLES); do \
+		  test "$$tab" = zone.tab && links='$(BACKWARD)' || links=''; \
+		  $(AWK) -f checktab.awk -v zone_table=$$tab $(YDATA) $$links \
+		    || exit; \
+		done
+		touch $@
+
+check_tzs:	$(TZS) $(TZS_NEW)
+		if test -s $(TZS); then \
+		  $(DIFF_TZS) $(TZS) $(TZS_NEW); \
+		else \
+		  cp $(TZS_NEW) $(TZS); \
+		fi
+		touch $@
+
+check_web:	$(CHECK_WEB_PAGES)
+check_theory.html: theory.html
+check_tz-art.html: tz-art.html
+check_tz-how-to.html: tz-how-to.html
+check_tz-link.html: tz-link.html
+check_theory.html check_tz-art.html check_tz-how-to.html check_tz-link.html:
+		$(CURL) -sS --url https://validator.w3.org/nu/ -F out=gnu \
+		    -F file=@$$(expr $@ : 'check_\(.*\)') -o $@.out && \
+		  test ! -s $@.out || { cat $@.out; exit 1; }
+		mv $@.out $@
+
+check_ziguard: rearguard.zi vanguard.zi ziguard.awk
+		$(AWK) -v DATAFORM=rearguard -f ziguard.awk vanguard.zi | \
+		  diff -u rearguard.zi -
+		$(AWK) -v DATAFORM=vanguard -f ziguard.awk rearguard.zi | \
+		  diff -u vanguard.zi -
+		touch $@
+
+# Check that zishrink.awk does not alter the data, and that ziguard.awk
+# preserves main-format data.
+check_zishrink: check_zishrink_posix check_zishrink_right
+check_zishrink_posix check_zishrink_right: \
+  zic leapseconds $(PACKRATDATA) $(PACKRATLIST) \
+  $(TDATA) $(DATAFORM).zi tzdata.zi
+		rm -fr $@.dir $@-t.dir $@-shrunk.dir
+		mkdir $@.dir $@-t.dir $@-shrunk.dir
+		case $@ in \
+		  *_right) leap='-L leapseconds';; \
+		  *) leap=;; \
+		esac && \
+		  $(ZIC) $$leap -d $@.dir $(DATAFORM).zi && \
+		  $(ZIC) $$leap -d $@-shrunk.dir tzdata.zi && \
+		  case $(DATAFORM),$(PACKRATLIST) in \
+		    main,) \
+		      $(ZIC) $$leap -d $@-t.dir $(TDATA) && \
+		      $(AWK) '/^Rule/' $(TDATA) | \
+			$(ZIC) $$leap -d $@-t.dir - $(PACKRATDATA) && \
+		      diff -r $@.dir $@-t.dir;; \
+		  esac
+		diff -r $@.dir $@-shrunk.dir
+		rm -fr $@.dir $@-t.dir $@-shrunk.dir
+		touch $@
+
+clean_misc:
+		rm -fr check_*.dir typecheck_*.dir
+		rm -f *.o *.out $(TIME_T_ALTERNATIVES) \
+		  check_* core typecheck_* \
+		  date tzdir.h tzselect version.h zdump zic libtz.a
+clean:		clean_misc
+		rm -fr *.dir tzdb-*/
+		rm -f *.zi $(TZS_NEW)
+
+maintainer-clean: clean
+		@echo 'This command is intended for maintainers to use; it'
+		@echo 'deletes files that may need special tools to rebuild.'
+		rm -f leapseconds version $(MANTXTS) $(TZS) *.asc *.tar.*
+
+names:
+		@echo $(ENCHILADA)
+
+public:		check check_public $(CHECK_TIME_T_ALTERNATIVES) \
+		tarballs signatures
+
+date.1.txt:	date.1
+newctime.3.txt:	newctime.3
+newstrftime.3.txt: newstrftime.3
+newtzset.3.txt:	newtzset.3
+time2posix.3.txt: time2posix.3
+tzfile.5.txt:	tzfile.5
+tzselect.8.txt:	tzselect.8
+zdump.8.txt:	zdump.8
+zic.8.txt:	zic.8
+
+$(MANTXTS):	workman.sh
+		LC_ALL=C sh workman.sh `expr $@ : '\(.*\)\.txt$$'` >$@.out
+		mv $@.out $@
+
+# Set file timestamps deterministically if possible,
+# so that tarballs containing the timestamps are reproducible.
+#
+# '$(SET_TIMESTAMP_N) N DEST A B C ...' sets the timestamp of the
+# file DEST to the maximum of the timestamps of the files A B C ...,
+# plus N if GNU ls and touch are available.
+SET_TIMESTAMP_N = sh -c '\
+  n=$$0 dest=$$1; shift; \
+  <"$$dest" && \
+  if test $$n != 0 && \
+     lsout=`ls -nt --time-style="+%s" "$$@" 2>/dev/null`; then \
+    set x $$lsout && \
+    timestamp=`expr $$7 + $$n` && \
+    echo "+ touch -md @$$timestamp $$dest" && \
+    touch -md @$$timestamp "$$dest"; \
+  else \
+    newest=`ls -t "$$@" | sed 1q` && \
+    echo "+ touch -mr $$newest $$dest" && \
+    touch -mr "$$newest" "$$dest"; \
+  fi'
+# If DEST depends on A B C ... in this Makefile, callers should use
+# $(SET_TIMESTAMP_DEP) DEST A B C ..., for the benefit of any
+# downstream 'make' that considers equal timestamps to be out of date.
+# POSIX allows this 'make' behavior, and HP-UX 'make' does it.
+# If all that matters is that the timestamp be reproducible
+# and plausible, use $(SET_TIMESTAMP).
+SET_TIMESTAMP = $(SET_TIMESTAMP_N) 0
+SET_TIMESTAMP_DEP = $(SET_TIMESTAMP_N) 1
+
+# Set the timestamps to those of the git repository, if available,
+# and if the files have not changed since then.
+# This uses GNU 'ls --time-style=+%s', which outputs the seconds count,
+# and GNU 'touch -d@N FILE', where N is the number of seconds since 1970.
+# If git or GNU is absent, don't bother to sync with git timestamps.
+# Also, set the timestamp of each prebuilt file like 'leapseconds'
+# to be the maximum of the files it depends on.
+set-timestamps.out: $(EIGHT_YARDS)
+		rm -f $@
+		if (type git) >/dev/null 2>&1 && \
+		   files=`git ls-files $(EIGHT_YARDS)` && \
+		   touch -md @1 test.out; then \
+		  rm -f test.out && \
+		  for file in $$files; do \
+		    if git diff --quiet $$file; then \
+		      time=`TZ=UTC0 git log -1 \
+			--format='tformat:%cd' \
+			--date='format:%Y-%m-%dT%H:%M:%SZ' \
+			$$file` && \
+		      echo "+ touch -md $$time $$file" && \
+		      touch -md $$time $$file; \
+		    else \
+		      echo >&2 "$$file: warning: does not match repository"; \
+		    fi || exit; \
+		  done; \
+		fi
+		$(SET_TIMESTAMP_DEP) leapseconds $(LEAP_DEPS)
+		for file in `ls $(MANTXTS) | sed 's/\.txt$$//'`; do \
+		  $(SET_TIMESTAMP_DEP) $$file.txt $$file workman.sh || \
+		    exit; \
+		done
+		$(SET_TIMESTAMP_DEP) version $(VERSION_DEPS)
+		$(SET_TIMESTAMP_DEP) tzdata.zi $(TZDATA_ZI_DEPS)
+		touch $@
+set-tzs-timestamp.out: $(TZS)
+		$(SET_TIMESTAMP_DEP) $(TZS) $(TZS_DEPS)
+		touch $@
+
+# The zics below ensure that each data file can stand on its own.
+# We also do an all-files run to catch links to links.
+
+check_public: $(VERSION_DEPS)
+		rm -fr public.dir
+		mkdir public.dir
+		ln $(VERSION_DEPS) public.dir
+		cd public.dir \
+		  && $(MAKE) CFLAGS='$(GCC_DEBUG_FLAGS)' TZDIR='$(TZDIR)' ALL
+		for i in $(TDATA_TO_CHECK) public.dir/tzdata.zi \
+		    public.dir/vanguard.zi public.dir/main.zi \
+		    public.dir/rearguard.zi; \
+		do \
+		  public.dir/zic -v -d public.dir/zoneinfo $$i 2>&1 || exit; \
+		done
+		public.dir/zic -v -d public.dir/zoneinfo-all $(TDATA_TO_CHECK)
+		:
+		: Also check 'backzone' syntax.
+		rm public.dir/main.zi
+		cd public.dir && $(MAKE) PACKRATDATA=backzone main.zi
+		public.dir/zic -d public.dir/zoneinfo main.zi
+		rm public.dir/main.zi
+		cd public.dir && \
+		  $(MAKE) PACKRATDATA=backzone PACKRATLIST=zone.tab main.zi
+		public.dir/zic -d public.dir/zoneinfo main.zi
+		:
+		rm -fr public.dir
+		touch $@
+
+# Check that the code works under various alternative
+# implementations of time_t.
+check_time_t_alternatives: $(TIME_T_ALTERNATIVES)
+$(TIME_T_ALTERNATIVES_TAIL): $(TIME_T_ALTERNATIVES_HEAD)
+$(TIME_T_ALTERNATIVES): $(VERSION_DEPS)
+		rm -fr $@.dir
+		mkdir $@.dir
+		ln $(VERSION_DEPS) $@.dir
+		case $@ in \
+		  int*32_t) range=-2147483648,2147483648;; \
+		  u*) range=0,4294967296;; \
+		  *) range=-4294967296,4294967296;; \
+		esac && \
+		wd=`pwd` && \
+		zones=`$(AWK) '/^[^#]/ { print $$3 }' <zone1970.tab` && \
+		if test $@ = $(TIME_T_ALTERNATIVES_HEAD); then \
+		  range_target=; \
+		else \
+		  range_target=to$$range.tzs; \
+		fi && \
+		(cd $@.dir && \
+		  $(MAKE) TOPDIR="$$wd/$@.dir" \
+		    CFLAGS='$(CFLAGS) -Dtime_tz='"'$@'" \
+		    REDO='$(REDO)' \
+			D=$$wd/$@.dir \
+		    TZS_YEAR="$$range" TZS_CUTOFF_FLAG="-t $$range" \
+		    install $$range_target) && \
+		test $@ = $(TIME_T_ALTERNATIVES_HEAD) || { \
+		  (cd $(TIME_T_ALTERNATIVES_HEAD).dir && \
+		    $(MAKE) TOPDIR="$$wd/$@.dir" \
+		      TZS_YEAR="$$range" TZS_CUTOFF_FLAG="-t $$range" \
+			D=$$wd/$@.dir \
+		      to$$range.tzs) && \
+		  $(DIFF_TZS) $(TIME_T_ALTERNATIVES_HEAD).dir/to$$range.tzs \
+			  $@.dir/to$$range.tzs && \
+		  if diff -q Makefile Makefile 2>/dev/null; then \
+		    quiet_option='-q'; \
+		  else \
+		    quiet_option=''; \
+		  fi && \
+		    diff $$quiet_option -r $(TIME_T_ALTERNATIVES_HEAD).dir/etc \
+					   $@.dir/etc && \
+		    diff $$quiet_option -r \
+		      $(TIME_T_ALTERNATIVES_HEAD).dir/usr/share \
+		      $@.dir/usr/share; \
+		}
+		touch $@
+
+TRADITIONAL_ASC = \
+  tzcode$(VERSION).tar.gz.asc \
+  tzdata$(VERSION).tar.gz.asc
+REARGUARD_ASC = \
+  tzdata$(VERSION)-rearguard.tar.gz.asc
+ALL_ASC = $(TRADITIONAL_ASC) $(REARGUARD_ASC) \
+  tzdb-$(VERSION).tar.lz.asc
+
+tarballs rearguard_tarballs tailored_tarballs traditional_tarballs \
+signatures rearguard_signatures traditional_signatures: \
+  version set-timestamps.out rearguard.zi vanguard.zi
+		VERSION=`cat version` && \
+		$(MAKE) AWK='$(AWK)' VERSION="$$VERSION" $@_version
+
+# These *_version rules are intended for use if VERSION is set by some
+# other means.  Ordinarily these rules are used only by the above
+# non-_version rules, which set VERSION on the 'make' command line.
+tarballs_version: traditional_tarballs_version rearguard_tarballs_version \
+  tzdb-$(VERSION).tar.lz
+rearguard_tarballs_version: \
+  tzdata$(VERSION)-rearguard.tar.gz
+traditional_tarballs_version: \
+  tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz
+tailored_tarballs_version: \
+  tzdata$(VERSION)-tailored.tar.gz
+signatures_version: $(ALL_ASC)
+rearguard_signatures_version: $(REARGUARD_ASC)
+traditional_signatures_version: $(TRADITIONAL_ASC)
+
+tzcode$(VERSION).tar.gz: set-timestamps.out
+		LC_ALL=C && export LC_ALL && \
+		tar $(TARFLAGS) -cf - \
+		    $(COMMON) $(DOCS) $(SOURCES) | \
+		  gzip $(GZIPFLAGS) >$@.out
+		mv $@.out $@
+
+tzdata$(VERSION).tar.gz: set-timestamps.out
+		LC_ALL=C && export LC_ALL && \
+		tar $(TARFLAGS) -cf - $(TZDATA_DIST) | \
+		  gzip $(GZIPFLAGS) >$@.out
+		mv $@.out $@
+
+# Create empty files with a reproducible timestamp.
+CREATE_EMPTY = TZ=UTC0 touch -mt 202010122253.00
+
+# The obsolescent *rearguard* targets and related macros are present
+# for backwards compatibility with tz releases 2018e through 2022a.
+# They should go away eventually.  To build rearguard tarballs you
+# can instead use 'make DATAFORM=rearguard tailored_tarballs'.
+tzdata$(VERSION)-rearguard.tar.gz: rearguard.zi set-timestamps.out
+		rm -fr $@.dir
+		mkdir $@.dir
+		ln $(TZDATA_DIST) $@.dir
+		cd $@.dir && rm -f $(TDATA) $(PACKRATDATA) version
+		for f in $(TDATA) $(PACKRATDATA); do \
+		  rearf=$@.dir/$$f; \
+		  $(AWK) -v DATAFORM=rearguard -f ziguard.awk $$f >$$rearf && \
+		  $(SET_TIMESTAMP_DEP) $$rearf ziguard.awk $$f || exit; \
+		done
+		sed '1s/$$/-rearguard/' <version >$@.dir/version
+		: The dummy pacificnew pacifies TZUpdater 2.3.1 and earlier.
+		$(CREATE_EMPTY) $@.dir/pacificnew
+		touch -mr version $@.dir/version
+		LC_ALL=C && export LC_ALL && \
+		  (cd $@.dir && \
+		   tar $(TARFLAGS) -cf - \
+			$(TZDATA_DIST) pacificnew | \
+		     gzip $(GZIPFLAGS)) >$@.out
+		mv $@.out $@
+
+# Create a tailored tarball suitable for TZUpdater and compatible tools.
+# For example, 'make DATAFORM=vanguard tailored_tarballs' makes a tarball
+# useful for testing whether TZUpdater supports vanguard form.
+# The generated tarball is not byte-for-byte equivalent to a hand-tailored
+# traditional tarball, as data entries are put into 'etcetera' even if they
+# came from some other source file.  However, the effect should be the same
+# for ordinary use, which reads all the source files.
+tzdata$(VERSION)-tailored.tar.gz: set-timestamps.out
+		rm -fr $@.dir
+		mkdir $@.dir
+		: The dummy pacificnew pacifies TZUpdater 2.3.1 and earlier.
+		cd $@.dir && \
+		  $(CREATE_EMPTY) $(PRIMARY_YDATA) $(NDATA) backward \
+		  `test $(DATAFORM) = vanguard || echo pacificnew`
+		(grep '^#' tzdata.zi && echo && cat $(DATAFORM).zi) \
+		  >$@.dir/etcetera
+		touch -mr tzdata.zi $@.dir/etcetera
+		sed -n \
+		  -e '/^# *version  *\(.*\)/h' \
+		  -e '/^# *ddeps  */H' \
+		  -e '$$!d' \
+		  -e 'g' \
+		  -e 's/^# *version  *//' \
+		  -e 's/\n# *ddeps  */-/' \
+		  -e 's/ /-/g' \
+		  -e 'p' \
+		  <tzdata.zi >$@.dir/version
+		touch -mr version $@.dir/version
+		links= && \
+		  for file in $(TZDATA_DIST); do \
+		    test -f $@.dir/$$file || links="$$links $$file"; \
+		  done && \
+		  ln $$links $@.dir
+		LC_ALL=C && export LC_ALL && \
+		  (cd $@.dir && \
+		   tar $(TARFLAGS) -cf - * | gzip $(GZIPFLAGS)) >$@.out
+		mv $@.out $@
+
+tzdb-$(VERSION).tar.lz: set-timestamps.out set-tzs-timestamp.out
+		rm -fr tzdb-$(VERSION)
+		mkdir tzdb-$(VERSION)
+		ln $(ENCHILADA) tzdb-$(VERSION)
+		$(SET_TIMESTAMP) tzdb-$(VERSION) tzdb-$(VERSION)/*
+		LC_ALL=C && export LC_ALL && \
+		tar $(TARFLAGS) -cf - tzdb-$(VERSION) | lzip -9 >$@.out
+		mv $@.out $@
+
+tzcode$(VERSION).tar.gz.asc: tzcode$(VERSION).tar.gz
+tzdata$(VERSION).tar.gz.asc: tzdata$(VERSION).tar.gz
+tzdata$(VERSION)-rearguard.tar.gz.asc: tzdata$(VERSION)-rearguard.tar.gz
+tzdb-$(VERSION).tar.lz.asc: tzdb-$(VERSION).tar.lz
+$(ALL_ASC):
+		$(GPG) --armor --detach-sign $?
+
+TYPECHECK_CFLAGS = $(CFLAGS) -DTYPECHECK -D__time_t_defined -D_TIME_T
+typecheck: typecheck_long_long typecheck_unsigned
+typecheck_long_long typecheck_unsigned: $(VERSION_DEPS)
+		rm -fr $@.dir
+		mkdir $@.dir
+		ln $(VERSION_DEPS) $@.dir
+		cd $@.dir && \
+		  case $@ in \
+		    *_long_long) i="long long";; \
+		    *_unsigned ) i="unsigned" ;; \
+		  esac && \
+		  typecheck_cflags='' && \
+		  $(MAKE) \
+		    CFLAGS="$(TYPECHECK_CFLAGS) \"-Dtime_t=$$i\"" \
+		    TOPDIR="`pwd`" \
+		    install
+		$@.dir/zdump -i -c 1970,1971 Europe/Rome
+		touch $@
+
+zonenames:	tzdata.zi
+		@$(AWK) '/^Z/ { print $$2 } /^L/ { print $$3 }' tzdata.zi
+
+asctime.o:	private.h tzfile.h
+date.o:		private.h
+difftime.o:	private.h
+localtime.o:	private.h tzfile.h tzdir.h
+strftime.o:	private.h tzfile.h
+zdump.o:	version.h
+zic.o:		private.h tzfile.h tzdir.h version.h
+
+.PHONY: ALL INSTALL all
+.PHONY: check check_mild check_time_t_alternatives
+.PHONY: check_web check_zishrink
+.PHONY: clean clean_misc commit-leap-seconds.list dummy.zd
+.PHONY: fetch-leap-seconds.list force_tzs
+.PHONY: install install_data maintainer-clean names
+.PHONY: posix_only posix_right public
+.PHONY: rearguard_signatures rearguard_signatures_version
+.PHONY: rearguard_tarballs rearguard_tarballs_version
+.PHONY: right_only right_posix signatures signatures_version
+.PHONY: tarballs tarballs_version
+.PHONY: traditional_signatures traditional_signatures_version
+.PHONY: traditional_tarballs traditional_tarballs_version
+.PHONY: tailored_tarballs tailored_tarballs_version
+.PHONY: typecheck
+.PHONY: zonenames zones
+.PHONY: $(ZDS)