title: how to find out R library location in Mac OSX?
body: <p>On linux it's usually <code>$HOME/R/...</code>, where is it on a Mac?</p>
  
  <p>I tried something like <code>locate Rcpp</code>, but didn't get any useful info.</p>
  
  <p>R is installed through homebrew, and OSX version is 10.9 (mavericks).</p>