[R] rggobi: Installation problems on OS X Snow Leopard

[Betsy Nichols]

Hello:
I have successfully installed both R and R64  for Apple OS X from
CRAN  plus GTK+2.14 and GGobi 2.1.8 from:
http://www.ggobi.org/downloads

I launch either R or R64 and try to install the rrgobi package and get
(with R64) the following:

R version 2.10.1 (2009-12-14)
Copyright (C) 2009 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

[R.app GUI 1.31 (5537) x86_64-apple-darwin9.8.0]

> install.packages("rggobi")
--- Please select a CRAN mirror for use in this session ---
Warning message:
In getDependencies(pkgs, dependencies, available, lib) :
  package ‘rggobi’ is not available
>

I get substantially the same thing with R.

Here is some info about my OS:
  System Version:	Mac OS X 10.6.2 (10C540)
  Kernel Version:	Darwin 10.2.0
  Boot Mode:	Normal
  Secure Virtual Memory:	Not Enabled
  64-bit Kernel and Extensions:	No

What am I doing wrong?  Any help would be MOST appreciated.
Thanks
Betsy