Update to 2.8.1:

* cmp and diff now conform to POSIX 1003.1-2001 (IEEE Std 1003.1-2001)
  if the underlying system conforms to POSIX and if the _POSIX2_VERSION
  environment variable is set to 200112.  Conformance removes support
  for `diff -NUM', where NUM is a number.  Use -C NUM or -U NUM instead.
* cmp now supports trailing operands SKIP1 and SKIP2, like BSD cmp.
* cmp -i or --ignore-initial now accepts SKIP1:SKIP2 option value.
* New cmp option: -n or --bytes.
* cmp's old -c or --print-chars option has been renamed;
  use -b or --print-bytes instead.
* cmp now outputs "byte" rather than "char" outside the POSIX locale.
* cmp -l's index column width now adjusts to fit larger (or smaller) files.
* cmp -l -s and cmp -s -l are not allowed.  Use cmp -s or cmp -l instead.
* diff uses ISO 8601 style time stamps for output times (e.g. "2001-11-23
  16:44:36.875702460 -0800") unless in the C or POSIX locale and the
  -c style is specified.
* diff's -I and -F options use the regexp syntax of grep, not of Emacs.
* diff now accepts multiple context arguments, and uses their maximum value.
* New diff and sdiff options:
  -E  --ignore-tab-expansion
  --strip-trailing-cr
* New diff options:
  --from-file=FILE, --to-file=FILE
  --ignore-file-name-case
  --no-ignore-file-name-case
* New diff3 and sdiff option:
  --diff-program=PROGRAM
* The following diff options are still accepted, but are no longer documented.
  They may be withdrawn in future releases.
  -h (omit; it has no effect)
  -H (use --speed-large-files instead)
  -L (use --label instead)
  -P (use --unidirectional-new-file instead)
  --inhibit-hunk-merge (omit; it has no effect)
* Recursive diffs now sort file names according to the LC_COLLATE locale
  category if possible, instead of using native byte comparison.
* Diff printf specs can now use the "0" and "'" flags.
* The new sdiff interactive command `ed' precedes each version with a header.
* On 64-bit hosts, files larger than 2 GB can be compared.
* Some internationalization support has been added, but multibyte locales
  are still not completely supported yet.
* Some diagnostics have been reworded slightly for consistency.
  Also, `diff -D FOO' now outputs `/* ! FOO */' instead of `/* not FOO */'.
* The `patch' part of the manual now describes `patch' version 2.5.4.
* Man pages are now distributed and installed.
* There is support for DJGPP; see the 'ms' subdirectory and the files
  m4/dos.m4 and */setmode.*.

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