Voluntary volunteer time, maybe?
Rtools uses g ++ 4.6.2. Which is quite suitable for using R, since R is a C program.
Now many of us use C ++ together with R (and judging by the tag Rcpp, you too), and this really creates a problem if you want to use functions available only in g ++ 4.7, 4.8, AFAIK has not yet released 4.9 or the equivalent version clang --- and when you are actually limited to Windows.
Linux OS X ( OS X 10.9, ).
- / MinGW - . , Rtools . , , R Core. R Core ++ g++ Windows, C...