[R] Makeconf on Windows - where?

[Paul Roebuck]

Read in the Windows release notes for 2.4.0 that:

  There is a new file etc/Makeconf that provides an
  approximation to the Unix version and may help with
  src/Makefile's.

Yet when I look at the CRAN binary I have for 2.4.1patched,
there are five files in the $R_HOME/etc directory, but no
Makeconf. Is the file only available with custom installs?

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