[Rd] normalizePath() warning

[Roger D. Peng]

I've been getting the following warning after running 'install.packages()' recently:

Warning message:
insufficient OS support on this platform in: normalizePath(path)

Does anyone know what this means?  And does anyone know how I can get rid of the 
warning?  I've just installed R on a fresh FC5 system so I feel I might have 
forgotten to install a package/library or something.

Thanks,
-roger