title: How do I install an R package from source?
body: <p>A friend sent me along this great tutorial on <a href="https://web.stanford.edu/%7Ecengel/cgi-bin/anthrospace/scraping-new-york-times-articles-with-r" rel="noreferrer">webscraping <em>The New York Times</em> with R</a>. I would really love to try it. However, the first step is to install a package called <a href="https://cran.r-project.org/web/packages/RJSONIO/" rel="noreferrer">RJSONIO</a> from source.</p>
  <p>I know R reasonably well, but I have no idea how to install a package from source.</p>
  <p>I'm running Mac OS X.</p>