[Rd] R_MAKEVARS_SITE for multiple archs

[Gábor Csárdi]

Dear all,

is there a way to set R_MAKEVARS_SITE (or something else), so that R
finds Makevars.site for multiple archs?

AFAICT the only option is to put the arch directories in R.home(). But
I might be missing something.

My goal is to set different make variables for 32-bit and 64-bit R on
Windows, without modifying R.home().

Thank you,
Gabor