[Rd] FLIBS in MacOS M1 binary at odds with documentation for optional libraries/tools

[Balasubramanian Narasimhan]

The Mac OS M1 pre-built binary arrives with a 
/Library/Frameworks/R.framework/Resources/etc/Makevars containing

FLIBS =  -L/Volumes/Builds/opt/R/arm64/gfortran/lib/gcc/aarch64-apple-darwin20.2.0/11.0.0 -L/Volumes/Builds/opt/R/arm64/gfortran/lib/gcc -L/Volumes/Builds/opt/R/arm64/gfortran/lib -lgfortran -lemutls_w -lm

This is inconsistent with what is at said at the top of 
https://mac.r-project.org/libs-arm64/: that all binaries live in 
/opt/R/arm64, not /Volumes/Builds/opt/R/arm64.

So no one would be able to build a source package containing Fortran 
without either modifying Makevars or creating symbolic links.

-Naras


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