Installing R on OSX

Install Homebrew (if you still don't have it) 
ruby -e "$(curl -fsSL" 

Install R 
brew tap homebrew/science 
brew install r

When running r, I got the following error message:

dyld: Library not loaded: /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib
  Referenced from: /usr/local/Cellar/r/3.3.1/R.framework/Versions/3.3/Resources/lib/libR.dylib
  Reason: image not found

Trace/BPT trap: 5

To fix this error, I had to do this:
brew reinstall gcc --with-fortran



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