What is the proper set up instructions for enabling gfortran for packages? My set up is
macOS Mojave 10.14.1
/Library/Developer/CommandLineTools # xcode-select -p
XQuartz 2.7.11
Microsoft R Open Feather Spray 3.5.1
clang version 6.0.0
GNU Fortran (Homebrew GCC 8.2.0) 8.2.0 # I have 6.1 in /usr/local/gfortran
Attempting to install any package that relies on gfortran gives
make: /usr/local/gfortran: Permission denied
make: *** [eigen.o] Error 1