title: Warning: Rtools is required
body: <p>Every time when I install package this warning occurs :<strong><em>WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:</em></strong></p>
  
  <p>I have been using R-Studio since 4 months and I did not come across this warning before. Despite getting this warning every time my installation succeeds.</p>