- CHANGES IN R 4.2.2:
  NEW FEATURES:
    * tools::Rdiff(useDiff = TRUE) checks for the presence of an
      external diff command and switches to useDiff = FALSE if none is
      found.  This allows R CMD Rdiff to always work.
    * On Windows, environment variable R_LIBCURL_SSL_REVOKE_BEST_EFFORT
      can be used to switch to only 'best-effort' SSL certificate
      revocation checks with the default "libcurl" download method.
      This reduces security, but may be needed for downloads to work
      with MITM proxies (PR#18379).
    * (macOS) The run-time check for libraries from XQuartz for X11 and
      Tcl/Tk no longer uses otool from the Apple Developer Tools
      (PR#18400).
    * The LaTeX style for producing the PDF manuals, Rd.sty, now loads
      the standard amsmath, amsfonts and amssymb packages for greater
      coverage of math commands in the Rd \eqn and \deqn macros.  The
      \mathscr LaTeX command is also provided (via the mathrsfs
      package, if available, or the amsfonts bundle otherwise),
      fulfilling the wish of PR#18398.
    * (Windows) The default format of readClipboard() and
      writeClipboard() has been changed to 13 (CF_UNICODETEXT).
  INSTALLATION on a UNIX-ALIKE:
    * The PDF manuals (if built) can be compacted by the new target
      make compact-pdf (at the top level or in directory doc/manual).
    * There is now configure support for LLVM clang 15 on Linux, which
      defaults to position-independent (PIE) executables whereas
      gfortran does not.
    * Many small changes to ease compilation (and suppress warnings)
      with LLVM clang 15.
  BUG FIXES:

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