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Rtools is a collection of software for building packages for R under Microsoft Windows, or for building R itself (version 1.9.0 or later). The original collection was put together by Prof. Brian Ripley; it is currently being maintained by Duncan Murdoch. Find R-tools Technology software downloads at CNET Download.com, the most comprehensive source for safe, trusted, and spyware-free downloads on the Web.

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I just posted an issue on stan-dev/rstan. It relates to the devtools-rstudio interface, specifically to the way in which RStudio installs Rtools once activated by a call to pkgbuild::has_build_tools(). The automated install is doing something I am not able to replicate with a manual install, and the manual install is causing rstan to fail. A good starting point would be to know precisely what this install script does. I'm hoping someone in the RStudio community can point me in the right direction. Perhaps the script is open code and I can just inspect it?