title: Does installing an R package with Rcpp require Rtools (Windows)
body: <p>I am making an R package with Rcpp. It works fine on my machine which has Rtools installed. But recently, I tried to install my package locally on a different machine (Windows) and got a compiling error. The reason was that on that machine there was no g++ compiler (for Windows, g++ is provided with Rtools). After installing Rtools, it worked just fine.</p>
  
  <p>So the question is, if I upload it to CRAN, does it still requires users to install Rtools by hand? Or does the function <code>install.package()</code> detect and install Rtools for them?</p>
  
  <p>Also, if you guys know some packages written with Rcpp, please let me know. I'd like to take a look how it works. </p>