r-rust/hellorust

Platform dependent makevars

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Hello! I wanted to ask for help!

We discovered this https://github.com/rust-lang/rust/blob/bf8fff783ff533c055d276378ada30563312def1/tests/run-make/tools.mk
and we wanted to adjust our Makevars, to include these (without CRAN complaints).

My issue is that I don't know how to do a uname way of assigning the right PKG_CFLAGS, and PKG_LIBS.

Do you have some guidance on this? It could really improve the portability of Rust in R.