title: How do I install an R package from the source tarball on windows?
body: <p>The <a href="http://robjhyndman.com/software/forecast/" rel="noreferrer">forecast package</a> for <strong>R</strong> has been updated to version <strong>2.12</strong>, but there are currently only windows binarys for 2.11 available on CRAN.</p>
  <p>How do I install an R package from <a href="http://cran.ms.unimelb.edu.au/src/contrib/forecast_2.12.tar.gz" rel="noreferrer">the source</a> on Windows?</p>