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This script isn't used by Emacs, and I can't imagine anyone else is
using it any more either...  From the commentary:
"This script is intended to be used to convert files with an
old-Emacs-style version history for use with VC (the Emacs 19
version-control interface), which likes to use RCS as its back end."

* lib-src/rcs-checkin: Remove file.
* lib-src/Makefile.in (INSTALLABLE_SCRIPTS, STAMP_INST_SCRIPTS):
Remove rcs-checkin.
(stamp-rcs-checkin): Remove.

* INSTALL, make-dist: Remove rcs-checkin.

* admin/quick-install-emacs (PUBLIC_LIBSRC_SCRIPTS): Remove rcs-checkin.

* doc/man/rcs-checkin.1: Remove.

* configure.in: Remove all mention of src/m/*.
(machine, machfile, M_FILE, config_machfile, and_machfile): Remove.
All uses removed.
(BITS_PER_CHAR, BITS_PER_SHORT, BITS_PER_INT, BITS_PER_LONG)
(BITS_PER_LONG_LONG): Move to src/lisp.h.
* lib/makefile.w32-in: Remove dependencies on
$(EMACS_ROOT)/src/m/intel386.h.
* make-dist: Don't make links to src/m.
* admin/CPP-DEFINES: Do not mention src/m/*.h.
(BITS_PER_EMACS_INT, BITS_PER_LONG, BITS_PER_CHAR)
(BITS_PER_SHORT, BITS_PER_INT): Remove.
* admin/MAINTAINERS: Remove src/m/.
* lib-src/makefile.w32-in: Remove dependencies on
$(EMACS_ROOT)/src/m/intel386.h.
* msdos/mainmake.v2 (TAGS tags): Don't look at $(CURDIR)/src/m/intel386.h.
* nt/config.nt: Do not include "m/intel386.h"; file was removed.
(BITS_PER_CHAR, BITS_PER_SHORT, BITS_PER_INT, BITS_PER_LONG):
Move to src/lisp.h.
(EMACS_INT_MAX): New macro.
This directory predates autoconf and is no longer needed nowadays.
Move its few remaining bits of functionality to where they're needed.
* src/m/README, src/m/alpha.h, src/m/amdx86-64.h, src/m/ia64.h, src/m/ibmrs6000.h:
* src/m/ibms390x.h, src/m/intel386.h, src/m/m68k.h, src/m/macppc.h:
* src/m/sparc.h, src/m/template.h: Remove.
* src/Makefile.in (M_FILE): Remove.  All uses removed.
* src/alloc.c (POINTERS_MIGHT_HIDE_IN_OBJECTS):
* src/lisp.h (USE_LSB_TAG):
* src/mem-limits.h (EXCEEDS_LISP_PTR):
Use VAL_MAX, not VALBITS, in #if.
* src/lisp.h (EMACS_INT_MAX): New macro, useful in #if.
(EMACS_UINT): Define unconditionally now.
(BITS_PER_CHAR, BITS_PER_SHORT, BITS_PER_INT, BITS_PER_LONG)
(BITS_PER_EMACS_INT): New constants, replacing
what used to be in config.h, but not useful in #if.
(GCTYPEBITS, VALBITS): Define unconditionally, since m/* files don't
define them any more.
(VAL_MAX): New macro.
(VALMASK): Use it.
* src/puresize.h (PURESIZE_RATIO): Use EMACS_INT_MAX, not
BITS_PER_EMACS_INT, in #if.
* src/s/aix4-2.h (BROKEN_FIONREAD, BROKEN_SIGAIO, BROKEN_SIGPTY)
(BROKEN_SIGPOLL): Move here from m/ibmrs6000.h, which was removed.
* src/s/gnu-linux.h (ULIMIT_BREAK_VALUE) [__i386__]:
* src/s/ms-w32.h (DATA_START):
Move here from removed file m/intel386.h.
* src/s/gnu.h (NLIST_STRUCT): Remove undef; 'configure' does this.
* src/s/irix6-5.h (_LP64): Remove; lisp.h no longer needs this.

* make-dist:
* Makefile.in (install-arch-indep):
* lisp/Makefile.in (update-subdirs):
* lisp/makefile.w32-in (update-subdirs-SH):
Update for this change.

* vpath.sed: Remove unused file.
* make-dist: No more vpath.sed.

* doc/lispref/two.el: Remove; unused since creation of two-volume.make.

* make-dist: No more doc/lispref/*.el.

I think it is not needed any more.

* doc/lispref/tindex.pl: Remove file.
* make-dist: No more doc/lispref/tindex.pl.

* nt/README.W32: Clarification for inclusion in source tarball.

 config.bat: Use config.in and Makefile.in from src/ and lib/, if
 they exist there, else from autogen/.
 make-dist: Don't add `autogen'.

 make-dist (tempdir): Create `autogen'.
 (msdos): Add depfiles.bat and inttypes.h.
 (autogen): Put README, config.in, and Makefile.in ionto the
 distribution, they are needed for the MS-DOS build.
 msdos/sed3v2.inp (insrcdir): Comment out definition.
 $(insrcdir): Edit into MS-DOS existence test.

admin/charsets/mapfiles/*.gz: Delete.  Add gunzipped versions.

See emacs-devel thread at

  http://lists.gnu.org/archive/html/emacs-devel/2011-08/msg00347.html

* m4/largefile.m4: New file, so that Emacs does not mess up when
accessing files with large inode numbers in MacOS X 10.5 and later.
* m4/nocrash.m4: New file, to avoid triggering background debugger
and/or create core dumps during 'configure'.
* build-aux/move-if-change: Renamed from move-if-change.
* build-aux/snippet/arg-nonnull.h: Renamed from arg-nonnull.h.
* build-aux/snippet/c++defs.h: Renamed from c++defs.h.
* build-aux/snippet/warn-on-use.h: Renamed from warn-on-use.h.
* build-aux/snippet/_Noreturn.h: New file, for draft C1X _Noreturn.
* .bzrignore: The autogenerated files compile, config.guess,
config.sub, depcomp, install-sh, and missing are now in build-aux.
* Makefile.in (epaths-force, sync-from-gnulib):
move-if-change is now in build-aux.
(GNULIB_TOOL_FLAGS): Avoid threadlib; this is now a prerequisite
of gnulib's pthread_sigmask module, but Emacs doesn't need it.
(mkdir): install-sh is now in build-aux.
* config.bat: c++defs.h is now in build-aux/snippets.
* configure.in: Specify AC_CONFIG_AUX_DIR with build-aux (the
usual parameter).
* lib/gnulib.mk, m4/gl-comp.m4: Regenerate.
* lib/makefile.w32-in (ARG_NONNULL_H): arg-nonnull.h moved
to build-aux/snippet.
* lib/pthread_sigmask.c, lib/stdlib.in.h, m4/extensions.m4:
* m4/getopt.m4, m4/gnulib-common.m4, m4/pthread_sigmask.m4:
Merge from gnuilib.  This fixes porting bugs on Cygwin, Irix, and
Solaris, enables MacOS extensions, and enables nocrash during
'configure'.
* make-dist: Adjust to new build-aux and build-aux/snippit dirs.
* admin/notes/copyright: The files compile, config.guess, config.sub,
depcomp, install-sh, missing, and move-if-change are now in the
new build-aux subdirectory.  The files arg-nonnull.h, c++defs.h,
and warn-on-use.h are now in build-aux/snippets.  New file
build-aux/snippets/_Noreturn.h.
* leim/Makefile.in (install): install-sh is now in build-aux.
* lib-src/Makefile.in ($(DESTDIR)${archlibdir}): install-sh moved
to build-aux.
* msdos/sedlibmk.inp (CONFIG_CLEAN_VPATH_FILES): Adjust to snippet moves
from top level to build-aux/snippet.
* src/Makefile.in (gl-stamp): move-if-change is now in build-aux.

* make-dist: Don't distribute test/.
* configure.in (OPT_MAKEFILES_IN): New output variable.
(AC_CONFIG_FILES): Conditionally include test/automated/Makefile.
* Makefile.in (OPT_MAKEFILES_IN): New, set by configure.
(SUBDIR_MAKEFILES_IN): Use $OPT_MAKEFILES_IN.
(check): Give an explicit error if test/ is not present.

* Makefile.in (mkdir): Use `install-sh -d' instead of mkinstalldirs.
(sync-from-gnulib): Don't sync mkinstalldirs.

* make-dist: Don't distribute mkinstalldirs.

* leim/Makefile.in (install): Use `install-sh -d' rather than mkinstalldirs.

* lib-src/Makefile.in ($(DESTDIR)${archlibdir}):
Use `install-sh -d' rather than mkinstalldirs.

* configure.in, doc/emacs/Makefile.in: Update comments.

* admin/notes/copyright: Remove mkinstalldirs.

Distribute every file under test/ that is under version control,
using patterns like *.el to capture files that are added later.
Without this change, "configure" would fail, because it would
attempt to build from a Makefile.in that was not distributed.

* make-dist: Remove EMACS_UNIBYTE unsetting; it does nothing.

Don't try to run autoconf if --no-update.

No-one can remember what this file was for.
http://lists.gnu.org/archive/html/emacs-devel/2010-10/msg00512.html

* nextstep/README: Move historical information to new file ../etc/NEXTSTEP.
* nextstep/AUTHORS: Merge into ./etc/NEXTSTEP and remove file.

* etc/NEXTSTEP: New file, extracted from ../nextstep/{AUTHORS,README}.

* make-dist: No more nextstep/AUTHORS.

* make-dist: Remove --compress.  Check for the appropriate
gzip-like executable, and if not found, don't compress.
Check version number in README, don't change it.
Use find for nt/inc/*.h.