.Renviron for multiple hardwares...

Our lab has a lot of different unix boxes, with different hardware, and 
I'm assuming (perhaps wrongly) that by setting a per-user package 
installation directory, the packages will only work on one type of 
hardware.  Our systems are all set up to share the same home directory 
(and, thus, the same .Renviron file) -- so, is there a way to set, in 
the .Renviron file, per-computer or per-hardware settings?  The idea is 
to have a different package installation directory for each computer 
(e.g. "~/R/computer1/packages" and "~/R/computer2/packages".

Thoughts?  Ideas?  Thanks!

--j

Jonathan A. Greenberg, PhD
Postdoctoral Scholar
Center for Spatial Technologies and Remote Sensing (CSTARS)
University of California, Davis
One Shields Avenue
The Barn, Room 250N
Davis, CA 95616
Cell: 415-794-5043
AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307