警告：需要 Rtools

Question

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.

Answer 1

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.

https://cran.r-project.org/bin/windows/Rtools/

Answer 2

I would like to translate the revolution measure fromhttps://blog.csdn.net/weixin_42098685/article/details/105864543 .

First step: Download and install the right Rtools for your R. Second step:
Tell the Rstudio where the Rtools is installed. Use this command (the sentence between the ##):

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

And it should Run as administrator.

Finally: Type the sentence between ## to examine whether we have succeed:

 Sys.which("make")

if you see a path rather than blank it means it had succeed. Like this