- CHANGES IN R 4.0.3:
  NEW FEATURES:
    * On platforms using configure option --with-internal-tzcode,
      additional values "internal" and (on macOS only) "macOS" are
      accepted for the environment variable TZDIR.  (See ?TZDIR.)
      On macOS, "macOS" is used by default if the system timezone
      database is a newer version than that in the R installation.
    * When install.packages(type = "source") fails to find a package in
      a repository it mentions package versions which are excluded by
      their R version requirement and links to hints on why a package
      might not be found.
    * The default value for options("timeout") can be set from
      enviromnent variable R_DEFAULT_INTERNET_TIMEOUT, still defaulting
      to 60 (seconds) if that is not set or invalid.
      This may be needed when child R processes are doing downloads,
      for example during the installation of source packages which
      download jars or other forms of data.
  LINK-TIME OPTIMIZATION on a UNIX-ALIKE:
    * There is now support for parallelized Link-Time Optimization
      (LTO) with GCC and for 'thin' LTO with clang _via_ setting the
      LTO macro.
    * There is support for setting a different LTO flag for the Fortran
      compiler, including to empty when mixing clang and gfortran (as
      on macOS).  See file config.site.
    * There is a new LTO_LD macro to set linker options for LTO
      compilation, for example to select an alternative linker or to
      parallelize thin LTO.
  DEPRECATED AND DEFUNCT:
    * The LINPACK argument to chol.default(), chol2inv(),
      solve.default() and svd() has been defunct since R 3.1.0.  Using

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