[R] Rtools required

[Steven]

Dear All

I updated to R-4.0.0. and also installed the latest Rtools 4.0 (to now 
the new default folder c:\rtools40). While compiling a package (binary) 
I received the follow marning message saying Rtools is required. Any 
clues? Thanks.

Steven Yen

WARNING: Rtools is required to build R packages but is not currently 
installed. Please download and install the appropriate version of Rtools 
before proceeding: https://cran.rstudio.com/bin/windows/Rtools/


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