CRAN offers to build, link and check packages with some selected third party software under Windows. The CRAN build machines for Windows (as well as the on-demand service available at https://win-builder.R-project.org/) are equipped with the software that is shipped with Rtools, see https://cran.r-project.org/bin/windows/Rtools/. In addition, third party software products installed are reflected by the environment and make variables listed below.
Please also read the ReadMe files in the repository corresponding to your version of R for more information about availability of binary package for R for Windows.
Ancient sources for third party software products used for building packages with R versions prior to R-4.2.0 are available from https://www.stats.ox.ac.uk/pub/Rtools/ or https://win-builder.R-project.org/GPLcompliance/.last change: April 17, 2023