What you are seeing is in the Applications folder and relates to the RStudio GUI, only. LAPACK is part of R which isn't installed there but in Library/Frameworks/R.framework/Versions/4.0/Resources/lib/ , /usr/local/lib/libR.dylib' or '/usr/lib/libR.dylib. Could you have installed an x86_64 on a Silicon box? And if $PATH is not familiar, I'd advise against trying to follow the ln procedure above. It's easy to trip up.