title: Getting error while installing flextable library
body: <p>I 'm getting following error while installing the <code>flextable</code> library at r studio.</p>
  
  <pre><code>ERROR: configuration failed for package ‘systemfonts’
  * removing ‘/home/user/R/x86_64-pc-linux-gnu-library/3.2/systemfonts’
  Warning in install.packages :
    installation of package ‘systemfonts’ had non-zero exit status
  ERROR: dependency ‘systemfonts’ is not available for package ‘gdtools’
  * removing ‘/home/user/R/x86_64-pc-linux-gnu-library/3.2/gdtools’
  Warning in install.packages :
    installation of package ‘gdtools’ had non-zero exit status
  ERROR: dependency ‘gdtools’ is not available for package ‘flextable’
  * removing ‘/home/user/R/x86_64-pc-linux-gnu-library/3.2/flextable’
  Warning in install.packages :
    installation of package ‘flextable’ had non-zero exit status
  
  The downloaded source packages are in
      ‘/tmp/RtmpN2KD39/downloaded_packages’
  </code></pre>