I develop my R packages on Linux machines - if you do this too, this is what I do and it can help you.
To make .zip for R, I basically βinstallβ it in a temporary directory and zip it. This .zip file can be used on Windows.
I put all this in a makefile for convenience, so that I can enter (for example) make doc to create documentation (since I use roxygen2), make package to do R CMD build , make zip to convert. tar.gz to .zip etc.
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