title: Setting R_LIBS & avoiding "Would you like to use a personal library instead?"
body: <p>My personal library is set as R_LIBS=~/.R/lib in ~/.Renviron. This works perfectly well when I install packages from rstudio. When I try installing new packages from a plain R console session, it always asks me:</p>
  
  <pre><code>Would you like to use a personal library instead?  (y/n) y
  Would you like to create a personal library
  ~/R/x86_64-redhat-linux-gnu-library/3.1
  to install packages into?  (y/n) n
  </code></pre>
  
  <p>When I do updates from the console session, existing packages in ~/.R/lib (previously installed from rstudio) are updated no problem. If there are global packages in /usr that also need updating, R again asks if I want to create ~/R/x86_64-redhat-linux-gnu-library/3.1.</p>
  
  <p>I've tried a number of configurations and have not found a way around this.</p>
  
  <p>Pro-tips?</p>