R help - Mar 2006 - Adding gs line to Renviron file on Mac

First the technical details: I'm running Mac OS 10.4.5, R 2.2.0, and  
just downloaded Ghostscript 8.50 to my Applications folder.

My problem is this: after adding

	## Ghostscript
	R_GSCMD=${RGSCMD='/usr/bin/gs'}

to my Renviron file, as suggested in several posts on this problem  
contained in the archives, I still get

	Error in bitmap("acaldi.bmp", res = 100) :
		sorry, 'gs' cannot be found
	/bin/sh: line 1: gs: command not found

in response to the bitmap(acaldi.bmp, res=100) command.  Any hints on  
what I'm doing wrong?  I'm a relative ignoramus on programming  
languages, so I really don't know where to begin fixing this problem.

Thanks.

Jim Milks

Graduate Student
Environmental Sciences Ph.D. Program
Wright State University
Dayton, OH 45435