Rtools 4.0, Rstudio and R 4.0.0

[Andrzej]

Hi,
So far I did not have any problems with installing Rtools (3.5) but after I have installed Rtools 4.0 looks like Rstudio can't find it. I use win10x64, and Rstudio daily 1.4. 301, Rx64 4.0.0.
I put everything in Path (and wrote this to .Renviron):

writeLines('PATH="${RTOOLS40_HOME}\\usr\\bin;${PATH}"', 
con = "~/.Renviron") 

and still not working. Next command gives me this:

Sys.which("make")
                              make 
"C:\\rtools40\\usr\\bin\\make.exe" 

but this:

pkgbuild::check_build_tools(debug = TRUE)

looping constantly showing this screen:

so Rtools are installed but Rstudio can't see them somehow and wants install it again.
Any ideas please ?

[Andrzej]

What command should I use to check which Rtools version do I use ?

[Megan_Huber]

I had a similar problem yesterday. I solved it by making sure Rtools was downloaded in the default location (directly in C:) and using devtools::find_rtools(). If that doesn't work, I have no clue how to help.