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Installing R with Homebrew

I'm trying to install R using Homebrew. I ran these commands which are recommended elsewhere on SO:
brew tap homebrew/science
brew install R

For brew tap homebrew/science, I'm receiving this error:

Error: Already tapped!

For the second command, I receive this:
Error: No available formula for r 

Any recommendations?

2 Answers

The method is the following:
brew tap homebrew/science
brew install Caskroom/cask/xquartz
brew install r

The gcc package (will be installed automatically as a required dependency) in the homebrew/science tap already contains the latest fortran compiler (gfortran), and most of all: the whole package is precompiled so it saves you a lot of compilation time.

This answer will also work for El Capitan and Mac OS Sierra.

In case you don't have XCode Command Line Tools (CLT), run from terminal:
xcode-select --install
As of 2017 / Brew 1.3.2 @ macOS Sierra 10.12.6 all you have to do is:

$ brew install r

You don't even need to tap homebrew/science since r is now a part of core formulae for the Homebrew (homebrew-core).

It will also install all dependencies automatically:

==> Installing dependencies for r: gmp, mpfr, libmpc, isl, gcc
There are two additional options you might want to know:

Build with java support
Build with openblas support

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