Install package and dependencies to a specific location. If you want the binaries cached, use destdir="/Rbins"
option. If you want the package(s) installed to a specific location, use lib="~/Rlibs"
. The default location on Windows is %userprofile%\Documents\R\win-library\3.0
.
install.packages("<package>", dependencies=NA, repos="http://cran.us.r-project.org")
R CMD INSTALL <package> -l ~/Rlibs
On Mac it would be something like
install.packages("<package>", dependencies=NA, type="mac.binary")