Hi,

Martin M. helped me focussing the context of my question.  The main result of my trials (various R4.x installations) after his mail is that the warning is issued when using *devtools* to install a package *from github*. When installing a package with install.packages(), no warning.

The warning looks like:

devtools::install_github("i-cyto/cytoBatchNorm")
WARNING: Rtools is required to build R packages, but no version of Rtools compatible with R 4.2.1 was found. (Only the following incompatible version(s) of Rtools were found: 4.0) Please download and install Rtools 4.2 from https://cran.r-project.org/bin/windows/Rtools/ or https://www.r-project.org/nosvn/winutf8/ucrt3/.
Downloading GitHub repo i-cyto/cytoBatchNorm@HEAD
...

I don't think there is a need of Rtools. Let me know if you think there is a need of Rtools being installed prior to installing a pure R package. From your answers, I may contact the maintainer of devtools.

Thanks for reading.

Bonne journée,
Samuel

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