title: Issue with installing R package on R studio
body: <p>I work on Rstudio and my version() result is:</p>
  <pre><code>&gt; version
                 _                           
  platform       x86_64-w64-mingw32          
  arch           x86_64                      
  os             mingw32                     
  system         x86_64, mingw32             
  status                                     
  major          3                           
  minor          3.1                         
  year           2016                        
  month          06                          
  day            21                          
  svn rev        70800                       
  language       R                           
  version.string R version 3.3.1 (2016-06-21)
  nickname       Bug in Your Hair
  </code></pre>
  <p>I downloaded the latest version this morning from the web to have the last update.
  On this, I can not install the package &quot;raster&quot;:</p>
  <pre><code>&gt; install.packages('raster')
  WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
  
  https://cran.rstudio.com/bin/windows/Rtools/
  Installing package into ‘C:/Users/florent/Documents/R/win-library/3.3’
  (as ‘lib’ is unspecified)
  Warning in install.packages :
    package ‘raster’ is not available (for R version 3.3.1)
  </code></pre>
  <p>I have checked many help online but I can´t find the solution. I did an update of R (to 4.0.2) with which this raster package is working.</p>
  <p>Anyone has a solution for this? It begins to be tricky...</p>
  <p>Thanks!</p>