title: Is Rtools incompatible with R version 3.5.1?
body: <p>I have tried <code>install.packages("Rtools")</code>, but this provides an error that states </p>
  
  <blockquote>
    <p>package ‘Rtools’ is not available (for R version 3.5.1) </p>
  </blockquote>
  
  <p>Given that the latest version of R is just a week old, should I wait for the R developers to catch up, or is this a bug I should report?</p>