[R] rgl.snapshot "failed"

[roger koenker]

I've installed the rgl package on a Suse x86-64 machine (further  
details below)
and it produces nice screen images.  Unfortunately, rgl.snapshot   
attempts to
make png files produces only the response "failed".  For other  
graphics png()
works fine, and capabilities indicates that it is there.  If anyone  
has a suggestion
of what might be explored at this point I'd be very appreciative.

platform x86_64-unknown-linux-gnu
arch     x86_64
os       linux-gnu
system   x86_64, linux-gnu
status
major    2
minor    1.0
year     2005
month    04
day      18
language R

url:    www.econ.uiuc.edu/~roger            Roger Koenker
email    rkoenker at uiuc.edu            Department of Economics
vox:     217-333-4558                University of Illinois
fax:       217-244-6678                Champaign, IL 61820