title: OpenMP, R and MacOS
body: <p>so I try to run a package called BTYDplus
  when I load it I got this warning </p>
  
  <p><code>This data.table install has not detected OpenMP support. It will work but slower in single threaded mode.</code></p>
  
  <p>I could run it without OpenMP but it is very slow, so I tried to install openMP by following this tutorial
  <a href="http://thecoatlessprofessor.com/programming/openmp-in-r-on-os-x/" rel="noreferrer">http://thecoatlessprofessor.com/programming/openmp-in-r-on-os-x/</a>
  but I stuck at <code>Enabling R to Compile Code with OpenMP on OS X</code> part specifically when I try to run <code>vim ~/.R/Makevars/</code>. It resulted with <code>"~/.R/Makevars/" Illegal file name</code>. </p>
  
  <p>any suggestion on how to tell R to use GCC ?</p>