[R-SIG-Win] Install multiple versions of Rtools

[JJ Allaire]

You can do the following:

1) Add the Rtools bin directory (e.g. C:\Rtools33\bin) to the PATH (so it
can find make, etc.)

2) Define  BINPREF environment variables as seen here:
https://github.com/RcppCore/Rcpp/blob/master/R/Attributes.R#L766-L767

Note that creating a valid path to the root Rtools directory is a bit
finicky so we have this helper function:
https://github.com/RcppCore/Rcpp/blob/master/R/Attributes.R#L780-L790.
Here's a C++ version of the same function that we use in RStudio:
https://github.com/rstudio/rstudio/blob/db703b6aff4f4136532e99bb1f2c081fe77f5601/src/cpp/core/r_util/RToolsInfo.cpp#L39-L46




On Sat, Oct 1, 2016 at 8:06 PM, Gábor Csárdi <csardi.gabor at gmail.com> wrote:

> Hi All,
>
> I would like to have both rtools 3.3 and 3.4 on the same machine, one
> in c:\rtools33, the other in c:\rtools34.
>
> I managed to do it via modifying the RHOME/etc/ARCH/Makeconf files. Is
> there a better way, by simply setting environment variables?
>
> Thanks much!
> Gabor
>
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