Install git2r from source on MacOSX Sierra

Install homebrew

In terminal:

brew install wget
brew install openssl
brew install libssh2
cd ~/Downloads/
wget https://cran.r-project.org/src/contrib/git2r_0.21.0.tar.gz
R CMD INSTALL --configure-args='--with-libssl-include=/opt/local/include --with- 
           libssl-lib=/opt/local/lib' git2r_0.21.0.tar.gz
rm git2r_0.21.0.tar.gz

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