R 4.0 using Rtools/ instead of rtools40/

Question

I recently updated R from 3.6.1 to 4.0.2. Along with that, I updated to the latest version of rtools (rtools40). I also followed instructions to add rtools40 to the PATH here .

However, after restarting R, Sys.which("make") gives "C:\\Rtools\\bin\\make.exe" , an older version of Rtools. But C:/Rtools/bin is not in my PATH.

Without deleting the old rtools, how can I tell R to use rtools40?

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Edit : It turns out that the old Rtools was on the system PATH (but not on the user PATH). Removing the old Rtools/ from system PATH fixed the issue.

Answer 1

Posting my comment as an answer, so that others may more easily find the solution:

When updating from Rtools to Rtools40, make sure that the old Rtools is removed from the system and user PATH . In order to check which version you have in your path, you can use Sys.which("make") like you suggested in your question.

It is also possible to check by running Sys.getenv("PATH") .