Maybe I should have mentioned this. I only installed it a couple of days ago - it is what is included in the newest version of the Rtools (http://cran.r-project.org/bin/windows/Rtools/
 
). And according to the instructions at http://cran.r-project.org/doc/manuals/R-admin.html#The-Windows-toolset:
 

If you want to build R or add-on packages from source in Windows, you will need to collect, install and test an extensive set of tools. See http://CRAN.R-project.org/bin/windows/Rtools/

 
 for the current locations and other updates to these instructions. (Most Windows users will not need to build add-on packages from source; see Add-on packages
 
 for details.)

We have found that the build process for R is quite sensitive to the choice of tools: please follow our instructions exactly, even to the choice of particular versions of the tools.44

 
 The build process for add-on packages is somewhat more forgiving, but we recommend using the exact toolset at first, and only substituting other tools once you are familiar with the process.

This appendix contains a lot of prescriptive comments. They are here as a result of bitter experience. Please do not report problems to the R mailing lists unless you have followed all the prescriptions.

We have collected most of the necessary tools (unfortunately not all, due to license or size limitations) into an executable installer named45

 
 Rtools215.exe, available from http://CRAN.R-project.org/bin/windows/Rtools/
 
. You should download and run it, choosing the default “Package authoring installation” to build add-on packages, or the “full installation” if you intend to build R.
 
Which is why I am on this version. I guess I could ignore it and upgrade, but ...


On Thu, Nov 1, 2012 at 2:09 PM, niXman <i.nixman@gmail.com> wrote:
> #if defined(__MINGW64__) || (__MINGW32_MAJOR_VERSION >3) ||             \
>     ((__MINGW32_MAJOR_VERSION==3) && (__MINGW32_MINOR_VERSION>=18))
>
> evaluating to false and  this

You are using mingw based on very old CRT.


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