Every time when I install package this warning occurs :WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
I have been using R-Studio since 4 months and I did not come across this warning before. Despite getting this warning every time my installation succeeds.
From here: missing Rtools, should I be worried?
This means that if you are going to install packages that need compilation, you also have to install Rtools in your system.