Also the binaries here live in /opt/R/arm64 to not conflict with Intel builds so you must add /opt/R/arm64/bin to your PATH in order to use them.
darwin.20 = for macOS 11 (Big Sur) or higher
Binaries built automatically via recipes are tagged with <system>.<version>-<arch>
Install by unpacking to the root, e.g.:
curl -O http://mac.R-project.org/libs-arm64/pkgconfig-0.28-darwin.20-arm64.tar.gz sudo tar fvxz pkgconfig-0.28-darwin.20-arm64.tar.gz -C /Most binaries (except for Tcl/Tk) live in /opt/R/arm64 and are static PIC builds (i.e. they can be used in R packages without the need for runtime dylibs). A copy of sources is available in /src.