Installing the latest and greatest ESS is no problem when there's no
existing ESS site installation.  For example, on my Windows machine, with
emacs 23.1.50.1, I can install the latest by following the instructions
here:

  http://ess.r-project.org/Manual/readme.html#Installation

Namely, I just add to my .emacs file:

  (require 'ess-site)
  (load "~/lib/emacs/ess-5.13/lisp/ess-site.el")

This works without me editing the 5.13 ess-site.el but I edit it anyway.

However, this procedure doesn't work on my Ubuntu machine at work, which has
ESS 5.7.1 loaded by sysadmin control -- at startup, emacs always loads the
5.7.1 version of ess-site stored in /etc/emacs/site-start.d.  This appears
to mean that my .emacs file settings have no effect, and that 5.7.1 is
always run instead of, say 5.13.

Since I can't change anything in /etc I need a .emacs file trick for
overriding an already-installed ESS 5.7.1.  This is on emacs 23.1.1.

Any advice?

Scott

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