Last Rtools is not identified by Rstudio

Question

I installed the last version of R and Rtools, then the last of Rstudio, but, when I try to install ggplot2, this warning is present

WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

how is it possible? How can I solve it?

Thanks to all.

Answer 1

I solved my issue: it was because of Bitdefender internet security, with its "safe files" protection, which blocked every changes on folders of its list. I gave authorizations and now it's ok.

Thanks to all.