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Add support for msys2 and rtools40 #86
This adds support for rtools40 / msys2 build environments:
Once the toolchain is in production we can further tweak this, but for now this should at least prevent check errors.
I'm trying to move towards a more standard toolchain bundle to make future maintenance easier, and allow users to use standard msys2 compilers if they want to.
Unix paths make it possible to include the proper
I don't understand why pkgbuild need to use undocumented information from
Using registry keys is pretty standard for most windows installers. Relying on undocumented environment variables is decidedly not. Are you planning on having a new environment variable for every release of Rtools? That is going to get cumbersome pretty quickly.
pkgbuild does thes same thing, the first thing it checks is R CMD CC
but for many users that is not changed from the default, Rtools won't be on their