* Noteworthy changes in Version 1.4.13 (2009-04-01) [stable]
  Released by Eric Blake, based on git version 1.4.12.*

** The manual is now distributed under the terms of FDL 1.3.

** The `divert' and `undivert' builtins have been made more efficient
   when using temporary files for large diversions.

** The `translit' builtin has been made more efficient when the second
   argument is short.

** The input engine has been optimized for faster processing.

** The command line option `--debugfile', introduced in 1.4.7, now
   treats its argument as optional, in order to allow setting the debug
   output back to stderr when used without an argument; and order is now
   significant with respect to command line files.  You must therefore use
   `m4 --debugfile=trace file', not `m4 file --debugfile trace'.  This
   change does not affect the deprecated `-o'/`--error-output' option.

** The `syscmd' and `esyscmd' builtins can be configured to use an
   alternate shell, via the new `configure' option `--with-syscmd-shell'.

** A number of portability improvements inherited from gnulib.

* Noteworthy changes in Version 1.4.12 (2008-10-10) [stable]
  Released by Eric Blake, based on git version 1.4.11.*

** Fix regression introduced in 1.4.4b where using `traceon' could delete
   a macro.  This was most noticeable with `traceon(`traceon')', but
   would also happen in cases such as `foo(traceon(`foo'))'.

** Fix regression introduced in 1.4.7 where `m4 -N9' died with an assertion
   failure.

** Fix regression introduced in 1.4.11 where `defn' died with an assertion
   failure on a traced but undefined macro.

** New `-g'/`--gnu' command-line option overrides `-G'/`--traditional'.
   For now, the environment variable POSIXLY_CORRECT has no effect on M4
   behavior; but a future release of M4 will behave as though --traditional
   is implied if POSIXLY_CORRECT is set (this future change is necessary,
   because in the current release, there is no way to disable GNU
   extensions that conflict with POSIX without the use of a non-POSIX
   command-line argument).  Clients of M4 that want to use GNU extensions,
   even when POSIXLY_CORRECT is set, should start using the -g command-line
   argument, even though it is currently a no-op if -G did not appear
   earlier in the command line, so that the client will not break in the
   face of an upgraded m4 and a POSIXLY_CORRECT execution environment.

** The `-L'/`--nesting-limit' command-line option now defaults to 0 for
   unlimited on platforms that can detect and deal with stack overflow.  On
   systems that lack alternate stack support, such as Cygwin, and on
   systems that do not obey the POSIX semantics for distinguishing stack
   overflow from other exceptions, such as Linux, you can optionally
   install the libsigsegv library (version 2.6 or newer recommended) to
   enhance m4's ability to accurately report stack overflow:
   http://www.gnu.org/software/libsigsegv/

** A number of portability improvements inherited from gnulib.

* Noteworthy changes in Version 1.4.11 (2008-04-02) [stable]
  Released by Eric Blake, based on git version 1.4.10a

** Security fixes for the -F option, for bugs present since -F was
   introduced in 1.3: Avoid core dump with 'm4 -F file -t undefined', and
   avoid arbitrary code execution with certain file names.

** Fix regression introduced in 1.4.9b in the `divert' builtin when more
   than 512 kibibytes are saved in diversions on platforms like NetBSD
   or darwin where fopen(name,"a+") seeks to the end of the file.

** The output of the `maketemp' and `mkstemp' builtins is now quoted if a
   file was created.  This is a minor security fix, because it was possible
   (although rather unlikely) that an unquoted string could match an
   existing macro name, such that use of the `mkstemp' output would trigger
   inadvertent macro expansion and operate on the wrong file name.

** Enhance the `defn' builtin to support concatenation of multiple text
   arguments, as required by POSIX.  However, at this time, it is not
   possible to concatenate a builtin macro with anything else; a warning is
   now issued if this is attempted, although a future version of M4 may
   lift this restriction to match other implementations.

** Enhance the `format' builtin to parse all C99 floating point numbers,
   even on platforms where strtod(3) is buggy, although the replacement
   function does have the known issue of rounding errors when parsing
   some decimal floating point values.  This fixes testsuite failures
   introduced in 1.4.9b.

** Enhance the `index' builtin to guarantee linear behavior, in spite of
   the surprisingly large number of systems with a brain-dead quadratic
   strstr(3).

** A number of portability improvements inherited from gnulib.