title: Error in R: (Package which is only available in source form, and may need compilation of C/C++/Fortran)
body: <p>I'm trying to install the 'yaml' and 'stringi' packages in R-Studio, and it keeps giving me these errors:</p>
  
  <pre><code>&gt; install.packages("stringi")
  Package which is only available in source form, and may need compilation of C/C++/Fortran: ‘stringi’
  These will not be installed
  </code></pre>
  
  <p>or</p>
  
  <pre><code>&gt; install.packages('yaml')
  Package which is only available in source form, and may need compilation of C/C++/Fortran: ‘yaml’
  These will not be installed
  </code></pre>
  
  <p>How can I get these to install properly?</p>