These are some notes about workarounds etc. for the devel/alpha version of R 4.2.0 that I have been using on Windows for the past few weeks.

  • to fix the text shadow in the syntax highlighting in the docs in RStudio, one workaround is to replace the prism.css file in the folder C:\Program Files\R\R-4.2.0alpha\doc\html with a modified css file. I just download the Tomorrow Night theme from https://prismjs.com/ and use that one because it doesn’t have a shadow by default.

  • for a clean break, I removed Rtools40 and remove any use of it in the PATH. Rtools42/R 4.2.0 do not depend on the path.

  • Rtools42 adds Rtools42 Bash to the start menu. I used pacman -Syuu to update the Msys2 stuff in Rtools. If I run this again, it will update other packages.

  • Here is the documentation page for Rtools42 https://cran.r-project.org/bin/windows/base/howto-R-4.2.html

(2026 note: idk why I was on an alpha. Maybe the native pipe or cmdstanr support?)

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