Author: eadler
Date: Sun Aug 12 22:06:35 2018
New Revision: 337694
URL: https://svnweb.freebsd.org/changeset/base/337694

Log:
  vendor/tzdb: reimport IANA database+code in a standard layout
  
  I am using a new directory since the layout of both the vendor area
  and contrib/ need to be changed.
  
  This is a recommit of r337683 with only code.

Added:
  vendor/tzdb/dist/
  vendor/tzdb/dist/CONTRIBUTING
  vendor/tzdb/dist/LICENSE
  vendor/tzdb/dist/Makefile   (contents, props changed)
  vendor/tzdb/dist/NEWS
  vendor/tzdb/dist/README
  vendor/tzdb/dist/asctime.c   (contents, props changed)
  vendor/tzdb/dist/calendars
  vendor/tzdb/dist/date.1   (contents, props changed)
  vendor/tzdb/dist/date.1.txt   (contents, props changed)
  vendor/tzdb/dist/date.c   (contents, props changed)
  vendor/tzdb/dist/difftime.c   (contents, props changed)
  vendor/tzdb/dist/localtime.c   (contents, props changed)
  vendor/tzdb/dist/newctime.3   (contents, props changed)
  vendor/tzdb/dist/newctime.3.txt   (contents, props changed)
  vendor/tzdb/dist/newstrftime.3   (contents, props changed)
  vendor/tzdb/dist/newstrftime.3.txt   (contents, props changed)
  vendor/tzdb/dist/newtzset.3   (contents, props changed)
  vendor/tzdb/dist/newtzset.3.txt   (contents, props changed)
  vendor/tzdb/dist/private.h   (contents, props changed)
  vendor/tzdb/dist/strftime.c   (contents, props changed)
  vendor/tzdb/dist/theory.html   (contents, props changed)
  vendor/tzdb/dist/time2posix.3   (contents, props changed)
  vendor/tzdb/dist/time2posix.3.txt   (contents, props changed)
  vendor/tzdb/dist/tz-art.html   (contents, props changed)
  vendor/tzdb/dist/tz-how-to.html   (contents, props changed)
  vendor/tzdb/dist/tz-link.html   (contents, props changed)
  vendor/tzdb/dist/tzfile.5   (contents, props changed)
  vendor/tzdb/dist/tzfile.5.txt   (contents, props changed)
  vendor/tzdb/dist/tzfile.h   (contents, props changed)
  vendor/tzdb/dist/tzselect.8   (contents, props changed)
  vendor/tzdb/dist/tzselect.8.txt   (contents, props changed)
  vendor/tzdb/dist/tzselect.ksh
  vendor/tzdb/dist/version
  vendor/tzdb/dist/workman.sh   (contents, props changed)
  vendor/tzdb/dist/zdump.8   (contents, props changed)
  vendor/tzdb/dist/zdump.8.txt   (contents, props changed)
  vendor/tzdb/dist/zdump.c   (contents, props changed)
  vendor/tzdb/dist/zic.8   (contents, props changed)
  vendor/tzdb/dist/zic.8.txt   (contents, props changed)
  vendor/tzdb/dist/zic.c   (contents, props changed)

Added: vendor/tzdb/dist/CONTRIBUTING
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ vendor/tzdb/dist/CONTRIBUTING       Sun Aug 12 22:06:35 2018        
(r337694)
@@ -0,0 +1,89 @@
+Contributing to the tz code and data
+
+The time zone database is by no means authoritative: governments
+change timekeeping rules erratically and sometimes with little
+warning, the data entries do not cover all of civil time before
+1970, and undoubtedly errors remain in the code and data.  Feel
+free to fill gaps or fix mistakes, and please email improvements
+to t...@iana.org for use in the future.  In your email, please give
+reliable sources that reviewers can check.
+
+-----
+
+Developers can contribute technical changes to the source code and
+data as follows.
+
+To email small changes, please run a POSIX shell command like
+'diff -u old/europe new/europe >myfix.patch', and attach
+myfix.patch to the email.
+
+For more-elaborate changes, please read the theory.html file and browse
+the mailing list archives <https://mm.icann.org/pipermail/tz/> for
+examples of patches that tend to work well.  Additions to
+data should contain commentary citing reliable sources as
+justification.  Citations should use https: URLs if available.
+
+Please submit changes against either the latest release in
+<https://www.iana.org/time-zones> or the master branch of the development
+repository.  The latter is preferred.  If you use Git the following
+workflow may be helpful:
+
+  * Copy the development repository.
+
+      git clone https://github.com/eggert/tz.git
+      cd tz
+
+  * Get current with the master branch.
+
+      git checkout master
+      git pull
+
+  * Switch to a new branch for the changes.  Choose a different
+    branch name for each change set.
+
+      git checkout -b mybranch
+
+  * Sleuth by using 'git blame'.  For example, when fixing data for
+    Africa/Sao_Tome, if the command 'git blame africa' outputs a line
+    '2951fa3b (Paul Eggert 2018-01-08 09:03:13 -0800 1068) Zone
+    Africa/Sao_Tome 0:26:56 - LMT 1884', commit 2951fa3b should
+    provide some justification for the 'Zone Africa/Sao_Tome' line.
+
+  * Edit source files.  Include commentary that justifies the
+    changes by citing reliable sources.
+
+  * Debug the changes, e.g.:
+
+      make check
+      make install
+      ./zdump -v America/Los_Angeles
+
+  * For each separable change, commit it in the new branch, e.g.:
+
+      git add northamerica
+      git commit
+
+    See recent 'git log' output for the commit-message style.
+
+  * Create patch files 0001-*, 0002-*, ...
+
+      git format-patch master
+
+  * After reviewing the patch files, send the patches to t...@iana.org
+    for others to review.
+
+      git send-email master
+
+    For an archived example of such an email, see
+    <https://mm.icann.org/pipermail/tz/2018-February/026122.html>.
+
+  * Start anew by getting current with the master branch again
+    (the second step above).
+
+Please do not create issues or pull requests on GitHub, as the
+proper procedure for proposing and distributing patches is via
+email as illustrated above.
+
+-----
+
+This file is in the public domain.

Added: vendor/tzdb/dist/LICENSE
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ vendor/tzdb/dist/LICENSE    Sun Aug 12 22:06:35 2018        (r337694)
@@ -0,0 +1,5 @@
+Unless specified below, all files in the tz code and data (including
+this LICENSE file) are in the public domain.
+
+If the files date.c, newstrftime.3, and strftime.c are present, they
+contain material derived from BSD and use the BSD 3-clause license.

Added: vendor/tzdb/dist/Makefile
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ vendor/tzdb/dist/Makefile   Sun Aug 12 22:06:35 2018        (r337694)
@@ -0,0 +1,1013 @@
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+
+# 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=      t...@iana.org
+
+# Choose source data features.  To get new features 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
+DATAFORM=              main
+
+# Change the line below for your time zone (after finding the zone you want in
+# the time zone files, or adding it to a time zone file).
+# Alternatively, if you discover you've got the wrong time zone, you can just
+#      zic -l rightzone
+# to correct things.
+# Use the command
+#      make zonenames
+# to get a list of the values you can use for LOCALTIME.
+
+LOCALTIME=     GMT
+
+# If you want something other than Eastern United States time as a template
+# for handling POSIX-style time zone environment variables,
+# change the line below (after finding the zone you want in the
+# time zone files, or adding it to a time zone file).
+# When a POSIX-style environment variable is handled, the rules in the
+# template file are used to determine "spring forward" and "fall back" days and
+# times; the environment variable itself specifies UT offsets of standard and
+# daylight saving time.
+# Alternatively, if you discover you've got the wrong time zone, you can just
+#      zic -p rightzone
+# to correct things.
+# Use the command
+#      make zonenames
+# to get a list of the values you can use for POSIXRULES.
+# If you want POSIX compatibility, use "America/New_York".
+
+POSIXRULES=    America/New_York
+
+# Also see TZDEFRULESTRING below, which takes effect only
+# if the time zone files 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 time zone 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" time zone 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.  int64_t should be first.
+TIME_T_ALTERNATIVES = int64_t int32_t uint32_t uint64_t
+
+# 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
+
+# To install data in text form that has all the information of the binary 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
+# If you also want the link US/Pacific-New, even though it is confusing
+# and is planned to be removed from the database eventually, use
+#      BACKWARD=       backward pacificnew
+# To omit these links, use
+#      BACKWARD=
+
+BACKWARD=      backward
+
+# If you want out-of-scope and often-wrong data from the file 'backzone', use
+#      PACKRATDATA=    backzone
+# To omit this data, use
+#      PACKRATDATA=
+
+PACKRATDATA=
+
+# 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
+
+# Since "." may not be in PATH...
+
+YEARISTYPE=    ./yearistype
+
+# Non-default libraries needed to link.
+LDLIBS=
+
+# Add the following to the end of the "CFLAGS=" line as needed to override
+# defaults specified in the source code.  "-DFOO" is equivalent to "-DFOO=1".
+#  -DBIG_BANG=-9999999LL if the Big Bang occurred at time -9999999 (see zic.c)
+#  -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_DIRECT_H if mkdir needs <direct.h> (MS-Windows)
+#  -DHAVE_GENERIC=0 if _Generic does not work
+#  -DHAVE_GETTEXT if 'gettext' works (e.g., GNU/Linux, FreeBSD, Solaris)
+#  -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 if you have a non-C99 compiler with <inttypes.h>
+#  -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_POSIX_DECLS=0 if your system's include files do not declare
+#      functions like 'link' or variables like 'tzname' required by POSIX
+#  -DHAVE_SNPRINTF=0 if your system lacks the snprintf function
+#  -DHAVE_STDBOOL_H if you have a non-C99 compiler with <stdbool.h>
+#  -DHAVE_STDINT_H if you have a non-C99 compiler with <stdint.h>
+#  -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 your compiler lacks a <sys/stat.h>
+#  -DHAVE_SYS_WAIT_H=0 if your compiler lacks a <sys/wait.h>
+#  -DHAVE_TZSET=0 if your system lacks a tzset function
+#  -DHAVE_UNISTD_H=0 if your compiler lacks a <unistd.h>
+#  -Dlocale_t=XXX if your system uses XXX instead of locale_t
+#  -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
+#  -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 if the time zone files cannot be accessed
+#  -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_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)
+#  $(GCC_DEBUG_FLAGS) if you are using recent GCC and want lots of checking
+# Select instrumentation via "make GCC_INSTRUMENT='whatever'".
+GCC_INSTRUMENT = \
+  -fsanitize=undefined -fsanitize-address-use-after-scope \
+  -fsanitize-undefined-trap-on-error -fstack-protector
+GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
+  $(GCC_INSTRUMENT) \
+  -Wall -Wextra \
+  -Walloc-size-larger-than=100000 -Warray-bounds=2 \
+  -Wbad-function-cast -Wcast-align=strict -Wdate-time \
+  -Wdeclaration-after-statement -Wdouble-promotion \
+  -Wformat=2 -Wformat-overflow=2 -Wformat-signedness -Wformat-truncation \
+  -Winit-self -Wjump-misses-init -Wlogical-op \
+  -Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
+  -Wold-style-definition -Woverlength-strings -Wpointer-arith \
+  -Wshadow -Wshift-overflow=2 -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 \
+  -Wvariadic-macros -Wvla -Wwrite-strings \
+  -Wno-address -Wno-format-nonliteral -Wno-sign-compare \
+  -Wno-type-limits -Wno-unused-parameter
+#
+# 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.  These two fields are not
+# required by POSIX, but 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
+# #    -DHAVE_TZNAME=1
+# # to the "CFLAGS=" line.  "tzname" is required by POSIX 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
+# #    -DUSG_COMPAT=1
+# # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by
+# # Unix Systems Group code and are required by POSIX 2008 (with XSI) and 
later.
+# # If not defined, the code attempts to guess USG_COMPAT from other macros.
+# #
+# # To support the external variable "altzone", add
+# #    -DALTZONE
+# # to the end of the "CFLAGS=" line; although "altzone" appeared in
+# # System V Release 3.1 it has not been standardized.
+#
+# 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 functions
+# "tzsetwall", "offtime", "timelocal", "timegm", "timeoff",
+# "posix2time", and "time2posix" to be added to the time conversion library.
+# "tzsetwall" is like "tzset" except that it arranges for local wall clock
+# time (rather than the time specified in the TZ environment variable)
+# to be used.
+# "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.
+# "timelocal" is equivalent to "mktime".
+# "timegm" is like "timelocal" except that it turns a struct tm into
+# a time_t using UT (rather than local time as "timelocal" does).
+# "timeoff" is like "timegm" except that it accepts a second (long) argument
+# that gives an offset to use when converting to a time_t.
+# "posix2time" and "time2posix" are described in an included manual page.
+# X3J11's work does not describe any of these functions.
+# Sun has provided "tzsetwall", "timelocal", and "timegm" in SunOS 4.0.
+# 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 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 time zone.
+# "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.
+
+CFLAGS=
+
+# Linker flags.  Default to $(LFLAGS) for backwards compatibility
+# to release 2012h and earlier.
+
+LDFLAGS=       $(LFLAGS)
+
+# For leap seconds, this Makefile uses LEAPSECONDS='-L leapseconds' in
+# submake command lines.  The default is no leap seconds.
+
+LEAPSECONDS=
+
+# The zic command and its arguments.
+
+zic=           ./zic
+ZIC=           $(zic) $(ZFLAGS)
+
+ZFLAGS=
+
+# How to use zic to install tz binary files.
+
+ZIC_INSTALL=   $(ZIC) -d '$(DESTDIR)$(TZDIR)' $(LEAPSECONDS)
+
+# The name of a Posix-compliant 'awk' on your system.
+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
+
+# The path where SGML DTDs are kept and the catalog file(s) to use when
+# validating.  The default should work on both Debian and Red Hat.
+SGML_TOPDIR= /usr
+SGML_DTDDIR= $(SGML_TOPDIR)/share/xml/w3c-sgml-lib/schema/dtd
+SGML_SEARCH_PATH= $(SGML_DTDDIR)/REC-html401-19991224
+SGML_CATALOG_FILES= \
+  
$(SGML_TOPDIR)/share/doc/w3-recs/html/www.w3.org/TR/1999/REC-html401-19991224/HTML4.cat:$(SGML_TOPDIR)/share/sgml/html/4.01/HTML4.cat
+
+# The name, arguments and environment of a program to validate your web pages.
+# See <http://openjade.sourceforge.net/doc/> for a validator, and
+# <https://validator.w3.org/source/> for a validation library.
+# Set VALIDATE=':' if you do not have such a program.
+VALIDATE = nsgmls
+VALIDATE_FLAGS = -s -B -wall -wno-unused-param
+VALIDATE_ENV = \
+  SGML_CATALOG_FILES='$(SGML_CATALOG_FILES)' \
+  SGML_SEARCH_PATH='$(SGML_SEARCH_PATH)' \
+  SP_CHARSET_FIXED=YES \
+  SP_ENCODING=UTF-8
+
+# 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)'-]'
+
+# Non-ASCII non-letters that OK_CHAR allows, as these characters are
+# useful in commentary.  XEmacs 21.5.34 displays them correctly,
+# presumably because they are Latin-1.
+UNUSUAL_OK_CHARSET= °±½¾×
+
+# 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= --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
+
+###############################################################################
+
+#MAKE=         make
+
+cc=            cc
+CC=            $(cc) -DTZDIR='"$(TZDIR)"'
+
+AR=            ar
+
+# ':' on typical hosts; 'ranlib' on the ancient hosts that still need ranlib.
+RANLIB=                :
+
+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
+LIBOBJS=       localtime.o asctime.o difftime.o
+HEADERS=       tzfile.h private.h
+NONLIBSRCS=    zic.c zdump.c
+NEWUCBSRCS=    date.c strftime.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 theory.html version
+WEB_PAGES=     tz-art.html tz-how-to.html tz-link.html
+DOCS=          $(MANS) date.1 $(MANTXTS) $(WEB_PAGES)
+PRIMARY_YDATA= africa antarctica asia australasia \
+               europe northamerica southamerica
+YDATA=         $(PRIMARY_YDATA) etcetera
+NDATA=         systemv factory
+TDATA_TO_CHECK=        $(YDATA) $(NDATA) backward pacificnew
+TDATA=         $(YDATA) $(NDATA) $(BACKWARD)
+ZONETABLES=    zone1970.tab zone.tab
+TABDATA=       iso3166.tab $(TZDATA_TEXT) $(ZONETABLES)
+LEAP_DEPS=     leapseconds.awk leap-seconds.list
+TZDATA_ZI_DEPS=        ziguard.awk zishrink.awk version $(TDATA) $(PACKRATDATA)
+DSTDATA_ZI_DEPS= ziguard.awk $(TDATA) $(PACKRATDATA)
+DATA=          $(TDATA_TO_CHECK) backzone iso3166.tab leap-seconds.list \
+                       leapseconds yearistype.sh $(ZONETABLES)
+AWK_SCRIPTS=   checklinks.awk checktab.awk leapseconds.awk \
+                       ziguard.awk zishrink.awk
+MISC=          $(AWK_SCRIPTS) zoneinfo2tdf.pl
+TZS_YEAR=      2050
+TZS=           to$(TZS_YEAR).tzs
+TZS_NEW=       to$(TZS_YEAR)new.tzs
+TZS_DEPS=      $(PRIMARY_YDATA) asctime.c localtime.c \
+                       private.h tzfile.h zdump.c zic.c
+ENCHILADA=     $(COMMON) $(DOCS) $(SOURCES) $(DATA) $(MISC) $(TZS) tzdata.zi
+
+# 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 \
+               africa antarctica asctime.c asia australasia \
+               backward backzone \
+               checklinks.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 \
+               pacificnew private.h \
+               southamerica strftime.c systemv theory.html \
+               time2posix.3 tz-art.html tz-how-to.html tz-link.html \
+               tzfile.5 tzfile.h tzselect.8 tzselect.ksh \
+               workman.sh yearistype.sh \
+               zdump.8 zdump.c zic.8 zic.c \
+               ziguard.awk zishrink.awk \
+               zone.tab zone1970.tab zoneinfo2tdf.pl
+
+# And for the benefit of csh users on systems that assume the user
+# shell should be used to handle commands in Makefiles. . .
+
+SHELL=         /bin/sh
+
+all:           tzselect yearistype 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) -p $(POSIXRULES) \
+                       -t '$(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/.'
+
+version:       $(VERSION_DEPS)
+               { (type git) >/dev/null 2>&1 && \
+                 V=`git describe --match '[0-9][0-9][0-9][0-9][a-z]*' \
+                               --abbrev=7 --dirty` || \
+                 V='$(VERSION)'; } && \
+               printf '%s\n' "$$V" >$@.out
+               mv $@.out $@
+
+# These files can be tailored by setting BACKWARD, PACKRATDATA, etc.
+vanguard.zi main.zi rearguard.zi: $(DSTDATA_ZI_DEPS)
+               $(AWK) -v DATAFORM=`expr $@ : '\(.*\).zi'` -f ziguard.awk \
+                 $(TDATA) $(PACKRATDATA) >$@.out
+               mv $@.out $@
+tzdata.zi:     $(DATAFORM).zi version
+               version=`sed 1q version` && \
+                 LC_ALL=C $(AWK) -v version="$$version" -f zishrink.awk \
+                   $(DATAFORM).zi >$@.out
+               mv $@.out $@
+
+version.h:     version
+               VERSION=`cat version` && printf '%s\n' \
+                 'static char const PKGVERSION[]="($(PACKAGE)) ";' \
+                 "static char const TZVERSION[]=\"$$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)
+
+yearistype:    yearistype.sh
+               cp yearistype.sh yearistype
+               chmod +x yearistype
+
+leapseconds:   $(LEAP_DEPS)
+               $(AWK) -f leapseconds.awk leap-seconds.list >$@.out
+               mv $@.out $@
+
+# Arguments to pass to submakes of install_data.
+# They can be overridden by later submake arguments.
+INSTALLARGS = \
+ BACKWARD='$(BACKWARD)' \
+ DESTDIR='$(DESTDIR)' \
+ LEAPSECONDS='$(LEAPSECONDS)' \
+ PACKRATDATA='$(PACKRATDATA)' \
+ TZDEFAULT='$(TZDEFAULT)' \
+ TZDIR='$(TZDIR)' \
+ YEARISTYPE='$(YEARISTYPE)' \
+ ZIC='$(ZIC)'
+
+# 'make install_data' installs one set of tz binary files.
+install_data:  zic leapseconds yearistype tzdata.zi
+               $(ZIC_INSTALL) tzdata.zi
+
+posix_only:
+               $(MAKE) $(INSTALLARGS) LEAPSECONDS= install_data
+
+right_only:
+               $(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
+
+# This obsolescent rule is present for backwards compatibility with
+# tz releases 2014g through 2015g.  It should go away eventually.
+posix_packrat:
+               $(MAKE) $(INSTALLARGS) PACKRATDATA=backzone posix_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 -c $(TZS_YEAR) '$(wd)/'$$(expr $@ : '\(.*\).zd') >$@
+
+$(TZS_NEW):    tzdata.zi zdump zic
+               rm -fr tzs.dir
+               mkdir tzs.dir
+               $(zic) -d tzs.dir tzdata.zi
+               $(AWK) '/^L/{print "Link\t" $$2 "\t" $$3}' \
+                  tzdata.zi | LC_ALL=C sort >$@.out
+               wd=`pwd` && \
+               set x `$(AWK) '/^Z/{print "tzs.dir/" $$2 ".zd"}' tzdata.zi \
+                       | LC_ALL=C sort -t . -k 2,2` && \
+               shift && \
+               ZDS=$$* && \
+               $(MAKE) wd="$$wd" TZS_YEAR=$(TZS_YEAR) ZDS="$$ZDS" $$ZDS && \
+               sed 's,^TZ=".*tzs\.dir/,TZ=",' $$ZDS >>$@.out
+               rm -fr tzs.dir
+               mv $@.out $@
+
+# If $(TZS) does not already exist (e.g., old-format tarballs), create it.
+# If it exists but 'make check_tzs' fails, a maintainer should inspect the
+# failed output and fix the inconsistency, perhaps by running 'make force_tzs'.
+$(TZS):
+               $(MAKE) force_tzs
+
+force_tzs:     $(TZS_NEW)
+               cp $(TZS_NEW) $(TZS)
+
+libtz.a:       $(LIBOBJS)
+               rm -f $@
+               $(AR) -rc $@ $(LIBOBJS)
+               $(RANLIB) $@
+
+date:          $(DATEOBJS)
+               $(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(DATEOBJS) $(LDLIBS)
+
+tzselect:      tzselect.ksh version
+               VERSION=`cat version` && sed \
+                       -e 's|#!/bin/bash|#!$(KSHELL)|g' \
+                       -e 's|AWK=[^}]*|AWK=$(AWK)|g' \
+                       -e 's|\(PKGVERSION\)=.*|\1='\''($(PACKAGE)) '\''|' \
+                       -e 's|\(REPORT_BUGS_TO\)=.*|\1=$(BUGEMAIL)|' \
+                       -e 's|TZDIR=[^}]*|TZDIR=$(TZDIR)|' \
+                       -e 's|\(TZVERSION\)=.*|\1='"$$VERSION"'|' \
+                       <$@.ksh >$@.out
+               chmod +x $@.out
+               mv $@.out $@
+
+check:         check_character_set check_white_space check_links \
+                 check_name_lengths check_sorted \
+                 check_tables check_web check_zishrink check_tzs
+
+check_character_set: $(ENCHILADA)
+       test ! '$(UTF8_LOCALE)' || \
+       ! printf 'A\304\200B\n' | \
+         LC_ALL='$(UTF8_LOCALE)' grep -q '^A.B$$' >/dev/null 2>&1 || { \
+               LC_ALL='$(UTF8_LOCALE)' && export LC_ALL && \
+               sharp='#' && \
+               ! grep -Env $(SAFE_LINE) $(MANS) date.1 $(MANTXTS) \
+                       $(MISC) $(SOURCES) $(WEB_PAGES) \
+                       CONTRIBUTING LICENSE README \
+                       version tzdata.zi && \
+               ! grep -Env $(SAFE_LINE)'|^UNUSUAL_OK_CHARSET='$(OK_CHAR)'*$$' \
+                       Makefile && \
+               ! grep -Env $(SAFE_SHARP_LINE) $(TDATA_TO_CHECK) backzone \
+                       leapseconds yearistype.sh zone.tab && \
+               ! grep -Env $(OK_LINE) $(ENCHILADA); \
+       }
+
+check_white_space: $(ENCHILADA)
+               patfmt=' \t|[\f\r\v]' && pat=`printf "$$patfmt\\n"` && \
+               ! grep -En "$$pat" $(ENCHILADA)
+               ! grep -n '[[:space:]]$$' \
+                       $$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list)
+
+PRECEDES_FILE_NAME = ^(Zone|Link[[:space:]]+[^[:space:]]+)[[:space:]]+
+FILE_NAME_COMPONENT_TOO_LONG = \
+  $(PRECEDES_FILE_NAME)[^[:space:]]*[^/[:space:]]{15}
+
+check_name_lengths: $(TDATA_TO_CHECK) backzone
+               ! grep -En '$(FILE_NAME_COMPONENT_TOO_LONG)' \
+                       $(TDATA_TO_CHECK) backzone
+
+CHECK_CC_LIST = { n = split($$1,a,/,/); for (i=2; i<=n; i++) print a[1], a[i]; 
}
+
+check_sorted: backward backzone iso3166.tab zone.tab zone1970.tab
+               $(AWK) '/^Link/ {print $$3}' backward | LC_ALL=C sort -cu
+               $(AWK) '/^Zone/ {print $$2}' backzone | LC_ALL=C sort -cu
+               $(AWK) '/^[^#]/ {print $$1}' iso3166.tab | LC_ALL=C sort -cu
+               $(AWK) '/^[^#]/ {print $$1}' zone.tab | LC_ALL=C sort -c
+               $(AWK) '/^[^#]/ {print substr($$0, 1, 2)}' zone1970.tab | \
+                 LC_ALL=C sort -c
+               $(AWK) '/^[^#]/ $(CHECK_CC_LIST)' zone1970.tab | \
+                 LC_ALL=C sort -cu
+
+check_links:   checklinks.awk $(TDATA_TO_CHECK) tzdata.zi
+               $(AWK) -f checklinks.awk $(TDATA_TO_CHECK)
+               $(AWK) -f checklinks.awk tzdata.zi
+
+check_tables:  checktab.awk $(PRIMARY_YDATA) $(ZONETABLES)
+               for tab in $(ZONETABLES); do \
+                 $(AWK) -f checktab.awk -v zone_table=$$tab $(PRIMARY_YDATA) \
+                   || exit; \
+               done
+
+check_tzs:     $(TZS) $(TZS_NEW)
+               diff -u $(TZS) $(TZS_NEW)
+
+# This checks only the HTML 4.01 strict page.
+# To check the the other pages, use <https://validator.w3.org/>.
+check_web:     tz-how-to.html
+               $(VALIDATE_ENV) $(VALIDATE) $(VALIDATE_FLAGS) tz-how-to.html
+
+# Check that zishrink.awk does not alter the data, and that ziguard.awk
+# preserves main-format data.
+check_zishrink: zic leapseconds $(PACKRATDATA) $(TDATA) \
+                 $(DATAFORM).zi tzdata.zi
+               for type in posix right; do \
+                 mkdir -p time_t.dir/$$type time_t.dir/$$type-t \
+                   time_t.dir/$$type-shrunk && \
+                 case $$type in \
+                   right) leap='-L leapseconds';; \
+                   *) leap=;; \
+                 esac && \
+                 $(ZIC) $$leap -d time_t.dir/$$type $(DATAFORM).zi && \
+                 case $(DATAFORM) in \
+                   main) \
+                     $(ZIC) $$leap -d time_t.dir/$$type-t $(TDATA) && \
+                     $(AWK) '/^Rule/' $(TDATA) | \
+                       $(ZIC) $$leap -d time_t.dir/$$type-t - \
+                         $(PACKRATDATA) && \
+                     diff -r time_t.dir/$$type time_t.dir/$$type-t;; \
+                 esac && \
+                 $(ZIC) $$leap -d time_t.dir/$$type-shrunk tzdata.zi && \
+                 diff -r time_t.dir/$$type time_t.dir/$$type-shrunk || exit; \
+               done
+               rm -fr time_t.dir
+
+clean_misc:
+               rm -f core *.o *.out \
+                 date tzselect version.h zdump zic yearistype libtz.a
+clean:         clean_misc
+               rm -fr *.dir *.zi tzdb-*/ $(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$$'` >$@.out
+               mv $@.out $@
+
+# Set the time stamps to those of the git repository, if available,
+# and if the files have not changed since then.
+# This uses GNU 'touch' syntax 'touch -d@N FILE',
+# where N is the number of seconds since 1970.
+# If git or GNU 'touch' is absent, don't bother to sync with git timestamps.
+# Also, set the timestamp of each prebuilt file like 'leapseconds'
+# to be the maximum of the files it depends on.
+set-timestamps.out: $(ENCHILADA)
+               rm -f $@
+               if (type git) >/dev/null 2>&1 && \
+                  files=`git ls-files $(ENCHILADA)` && \
+                  touch -md @1 test.out; then \
+                 rm -f test.out && \
+                 for file in $$files; do \
+                   if git diff --quiet $$file; then \
+                     time=`git log -1 --format='tformat:%ct' $$file` && \
+                     touch -cmd @$$time $$file; \
+                   else \
+                     echo >&2 "$$file: warning: does not match repository"; \
+                   fi || exit; \
+                 done; \
+               fi
+               touch -cmr `ls -t $(LEAP_DEPS) | sed 1q` leapseconds
+               for file in `ls $(MANTXTS) | sed 's/\.txt$$//'`; do \
+                 touch -cmr `ls -t $$file workman.sh | sed 1q` $$file.txt || \
+                   exit; \
+               done
+               touch -cmr `ls -t $(TZDATA_ZI_DEPS) | sed 1q` tzdata.zi
+               touch -cmr `ls -t $(TZS_DEPS) | sed 1q` $(TZS)
+               touch -cmr `ls -t $(VERSION_DEPS) | sed 1q` version
+               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:
+               $(MAKE) maintainer-clean
+               $(MAKE) CFLAGS='$(GCC_DEBUG_FLAGS)' ALL
+               mkdir -p public.dir
+               for i in $(TDATA_TO_CHECK) tzdata.zi; do \
+                 $(zic) -v -d public.dir $$i 2>&1 || exit; \
+               done
+               $(zic) -v -d public.dir $(TDATA_TO_CHECK)
+               rm -fr public.dir
+
+# Check that the code works under various alternative
+# implementations of time_t.
+check_time_t_alternatives:
+               if diff -q Makefile Makefile 2>/dev/null; then \
+                 quiet_option='-q'; \
+               else \
+                 quiet_option=''; \
+               fi && \
+               wd=`pwd` && \
+               zones=`$(AWK) '/^[^#]/ { print $$3 }' <zone1970.tab` && \
+               for type in $(TIME_T_ALTERNATIVES); do \
+                 mkdir -p time_t.dir/$$type && \
+                 $(MAKE) clean_misc && \
+                 $(MAKE) TOPDIR="$$wd/time_t.dir/$$type" \
+                   CFLAGS='$(CFLAGS) -Dtime_tz='"'$$type'" \
+                   REDO='$(REDO)' \
+                   install && \
+                 diff $$quiet_option -r \
+                   time_t.dir/int64_t/etc \
+                   time_t.dir/$$type/etc && \
+                 diff $$quiet_option -r \
+                   time_t.dir/int64_t/usr/share \
+                   time_t.dir/$$type/usr/share && \
+                 case $$type in \
+                 int32_t) range=-2147483648,2147483647;; \
+                 uint32_t) range=0,4294967296;; \
+                 int64_t) continue;; \
+                 *u*) range=0,10000000000;; \
+                 *) range=-10000000000,10000000000;; \
+                 esac && \
+                 echo checking $$type zones ... && \
+                 time_t.dir/int64_t/usr/bin/zdump -V -t $$range $$zones \

*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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