Rtools is not being detected from RStudio

Question

I am using latest R, RStudio and Rtools.

-- I have updated the environment variables. Now I can call gcc, or R from command line.

While I was trying to publi

Answer 1

Note that there are new potential kinds of problems (from R 3.3 onwards), since R (not RStudio, but R) adds a BINPREF variable and modifies the Path variable by default, see the Renviron.site file for the latter, on Windows typically e.g. under C:\Program Files\R\R-3.4.3\etc:

PATH="C:\Rtools\bin;${PATH}" 

This might easily conflict for people with a custom path and/or multiple versions of Rtools installed, so I have commented this out with a #.

For the BINPREF problem, see the Makeconf file, e.g. under C:\Program Files\R\R-3.4.3\etc\x64:

BINPREF ?= c:/Rtools/mingw_64/bin/

I have then modified this to c:/Rtools34/mingw_64/bin/, which is where I have installed my Rtools34.
You can do the same for the Makeconf file under the 32-bit arch. sub-directory.