[R] png support on R debian sid 1.8.1 binary

[Angel -]

I have updated my R to the current R version (1.8.1) using apt-get of the R 
binaries for debian sid in cran.
Now, when I do:
png(file="myplot.png")
I get:
Error in X11(paste("png::", filename, sep = ""), width, height, pointsize,  
:
        unable to start device PNG
In addition: Warning message:
No png support in this version of R

what do I have to do to get the png support?
Thanks,
Angel

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