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Suggested by Stefan Monnier in:
https://lists.gnu.org/r/emacs-devel/2019-03/msg00789.html
* INSTALL, etc/NEWS: Document this.
* configure.ac: Implement this.

Run 'TZ=UTC0 admin/update-copyright $(git ls-files)'.

* INSTALL: Mention dnf and Debian unversioned emacs package.
* doc/misc/efaq.texi (Installing Emacs): Mention dnf.

Run admin/update-copyright.

Problem reported by N. Jackson (Bug#28597).
This improves an earlier suggestion by Robert Pluim (Bug#28597#47).
* INSTALL, configure.ac, etc/NEWS:
Make --with-pop the default only on native MS-Windows.

Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November.  Change these FTP URLs to https://ftp.gnu.org
instead.  Make similar changes for URLs to other organizations moving
away from FTP.  Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.

While testing --enable-link-time-optimization with GCC 7.1.1
I ran into a serious GCC code-generation bug which makes me
think that --enable-link-time-optimization should be
discouraged for typical installs (Bug#28213).  See:
https://bugzilla.redhat.com/show_bug.cgi?id=1486455

* configure.ac (with_mailutils): Default to 'yes' if GNU Mailutils
is installed.  See:
http://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00054.html

* INSTALL (--with-modules): List cleanup attribute as prereq.
* src/conf_post.h (__has_attribute_cleanup): Remove; no longer needed.
* src/emacs-module.c (MODULE_SETJMP_1): Don’t attempt to verify
(__has_attribute (cleanup)), as Oracle Studio 12.5 supports
__has_attribute only inside preprocessor expressions.  The C
compiler should check the cleanup attribute in the next line anyway.
(module_reset_handlerlist): Remove an unnecessary ‘const’
that causes Oracle Studio 12.5 to refuse to compile.

This reverts commit 9319de67.

Suggested by Angelo Graziosi in:
http://lists.gnu.org/archive/html/emacs-devel/2017-03/msg00431.html
* configure.ac: Change the default from --with-pop to
--without-pop.  Adjust diagnostics to match.

The new configure option --with-mailutils lets the builder say
that Emacs should assume that GNU Mailutils is installed, instead
of continuing to build and install its own limited and insecure
substitute for 'movemail'.
* INSTALL, etc/NEWS, etc/PROBLEMS: Mention --with-mailutils.
* configure.ac: Add --with-mailutils option.
(with_mailutils): New variable.
Do not bother configuring 'movemail' when not building it.
Warn about issues relating to --with-mailutils.
* doc/emacs/rmail.texi (Movemail): Mention --with-mailutils.
(Movemail, Remote Mailboxes): Document port numbers in
POP and IMAP URLs.
* lib-src/Makefile.in (with_mailutils): New macro.
(UTILITIES): Use it.

Run admin/update-copyright.

Apple changed the spelling of its operating system again, to "macOS",
effective with macOS 10.12 Sierra (2016-09-20).  Change Emacs
documentation and comments to match this.  Stick with older OS
spellings ("OS X", "Mac OS X") when talking about older releases where
the older names are more correct.

However, do not fail; just issue the warnings.  Add an option
--enable-gcc-warnings=warn-only to configure, to implement this.
* INSTALL, etc/NEWS: Document this.
* configure.ac (gl_GCC_VERSION_IFELSE): New macro, from coreutils.
(gl_gcc_warnings, WERROR_CFLAGS): Use it to add new option.
Don’t treat --with-x-toolkit=no as a special case when configuring
warnings.

Run admin/update-copyright.

* CONTRIBUTE, INSTALL, Makefile.in, README, configure.ac, make-dist:
Prefer to single-quote 'like this' (instead of the older style
`like this').
* configure.ac: Fix some space-before-tab problems that 'git commit'
complained about.

This greatly shortens the 'make' output, making it more readable
and useful.  For example, on my platform it shortens a
4125-character line "gcc -std=gnu99 -c -Demacs -I. -I. -I../lib
... emacs.c" -- a line so long that it's hard to see what's going
on or where the diagnostics are -- to just "CC emacs.o".
* INSTALL: Document this.
* configure.ac: Add AM_SILENT_RULES([yes]).
(AM_DEFAULT_VERBOSITY): Remove now-unnecessary initialization.
* etc/NEWS: Document this.
Fixes: bug#19501

Run admin/update-copyright.

Run admin/update-copyright.

Ref: http://lists.gnu.org/archive/html/emacs-devel/2014-12/msg00145.html

* lib-src/grep-changelog: Remove file.

* lib-src/Makefile.in (INSTALLABLE_SCRIPTS): Remove.
(all, install, uninstall): Remove INSTALLABLE_SCRIPTS.

* doc/man/grep-changelog.1: Remove file.

* make-dist: No more lib-src/grep-changelog.

* INSTALL: No longer mention grep-changelog.

* admin/quick-install-emacs (PUBLIC_LIBSRC_SCRIPTS): Remove, and all uses.

* admin/authors.el (authors-valid-file-names): Add grep-changelog.

* etc/NEWS: Mention this.

No-one needs to know those details, and this file is too long already.

* INSTALL, etc/NEWS: Document this.
* lib-src/Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
(am__v_CC_0, am__v_CC_1, AM_V_CCLD, am__v_CCLD_, am__v_CCLD_0)
(am__v_CCLD_1): New macros, taken from Automake.
(regex.o, etags${EXEEXT}, ctags${EXEEXT}, ebrowse${EXEEXT})
(profile${EXEEXT}, make-docfile${EXEEXT}, movemail${EXEEXT})
(pop.o, emacsclient${EXEEXT}, emacsclientw${EXEEXT})
(emacsclientw${EXEEXT}, ntlib.o, hexl${EXEEXT})
(update-game-score${EXEEXT}): Use them.
* lwlib/Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
(am__v_CC_0, am__v_CC_1): New macros, taken from Automake.
(.c.o): Use them.
* oldXMenu/Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
(am__v_CC_0, am__v_CC_1): New macros, taken from Automake.
(.c.o): Use them.
* src/Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
(am__v_CC_0, am__v_CC_1, AM_V_CCLD, am__v_CCLD_, am__v_CCLD_0)
(am__v_CCLD_1): New macros, taken from Automake.
(.c.o, .m.o, temacs$(EXEEXT)): Use them.

* INSTALL: Remove apparently unmaintained documentation about what
--without-all exactly means.

* INSTALL: Prefer './configure FOO=BAR' to 'FOO=BAR ./configure'.
* INSTALL.REPO: pkg-config is no longer required to build from
the repository.
* autogen.sh: Don't check for pkg-config.
(progs): Remove pkg-config.
(pkg_config_min, AUTORECONF_ENV, env_space, ACLOCAL_PATH):
Remove.  All uses removed.
* m4/pkg.m4: New file, built by admin/merge-pkg-config.
* configure.ac: Remove unnecessary m4_pattern_forbid of ^PKG_ and
an AC_ARG_VAR of PKG_CONFIG_PATH.  pkg.m4 does that for us.
(EMACS_CHECK_MODULES): Remove workaround for old pkg-config bug,
as we use pkg.m4 from a newer pkg-config.
* admin/merge-pkg-config: New script.
* admin/notes/copyright: Update for m4/*.m4, in particular m4/pkg.m4.
* etc/NEWS: Prefer './configure FOO=BAR' to 'FOO=BAR ./configure'.
* etc/PROBLEMS (Build-time-problems): Remove pkg-config problem
that is no longer an issue.
* nt/INSTALL: Remove no-longer-needed notes about pkg-config.

* INSTALL: Mention it.
* etc/PROBLEMS: Mention potential problems with
--enable-link-time-optimization and clang on Fedora 20.

Ref: http://debbugs.gnu.org/16717#45
If no-one objects, we can then start getting rid of some of the
convoluted Makefile hacks that exist to support non-GNU makes.

* configure.ac: Require GNU make.
(HAVE_GNU_MAKE): Remove.

* INSTALL, etc/NEWS, etc/PROBLEMS: Update for this change.

* Makefile.in: Comment.

The class of problems that this was designed to detect, namely .elc
files getting corrupted by being passed around by email via uuencode
or somesuch, has not been a relevant concern for many years.

* lib-src/test-distrib.c, lib-src/testfile: Remove.

* lib-src/Makefile.in (DONT_INSTALL): Remove test-distrib.
(test-distrib${EXEEXT}): Remove rule.

* make-dist: Do not distribute lib-src/testfile.

* admin/quick-install-emacs (AVOID): Remove testfile and test-distrib.

* INSTALL, etc/PROBLEMS, admin/notes/unicode:
Remove references to test-distrib and testfile.

and even http://lesstif.sourceforge.net/ recommends it over LessTif.