Sweave.sty

Please, allow me a simple question: must I get a copy of Sweave.sty 
installed with R-2.11.1.pkg?

I'm a bit puzzle with this issue and I think that this file is not 
installed with R-2.11.1.pkg. Could you confirm if I am right?

Sweave.sty should have been installed with R, in the directory given by

file.path(R.home(), "share", "texmf")

The organization of that directory will change with the 2.12.0 release 
(becoming compliant with a TeX standard whose name I forget), so don't 
carve the path in stone.

Duncan Murdoch