title: Install and use RPy2 (using conda) so that it uses default R installation in /usr/lib/R R
body: <p>I want to call functions from my R packages in Python using RPy2. I installed RPy2 using conda and realized it installed a fresh copy of R inside conda... I don't want that. I just want to have and use one R, the default one in /usr/lib/R.</p>
  
  <p>How to do that? How to force conda and Python and RPy2 to use default R installed in /usr/lib/R?</p>