Everytime I upgrade R using homebrew I need to install most packages again

Question

R Packages are installed to /usr/local/Cellar/r/3.1.2_1/R.framework/Versions/3.1/Resources/library

Whenever I run brew upgrade r and the versio

Answer 1

I put .libPaths("/Users/tim/.R/packages") in my ~/.Rprofile so that packages are installed to a path that doesn't disappear after a version bump.