Link Homebrew OpenBLAS with R BLAS

openblas-mac-r.sh

# Install Homebrew if needed: https://brew.sh/

# Install OpenBLAS with Homebrew:
brew install openblas

# Check the installed location of openblas:
brew --prefix openblas

# For me, that returns:
# /opt/homebrew/opt/openblas

# Now, we need to make a symlink from the openblas library file to the R BLAS library file.

# First switch to the directory with the R BLAS library:
cd /Library/Frameworks/R.framework/Resources/lib/

# Now symlink openblas to the R BLAS library file location:
# If your openblas path was different from mine, replace it in this line:
ln -s -i -v /opt/homebrew/opt/openblas/lib/libopenblas.dylib libRblas.dylib

# When you restart R, it should now call libopenblas.dylib for math

# To switch back
cd /Library/Frameworks/R.framework/Resources/lib/
ln -s -i -v libRblas.0.dylib libRblas.dylib