Install xml2 package in MacOSX

In terminal:

brew install libxml2

 wget https://cran.r-project.org/src/contrib/xml2_1.2.5.tar.gz

 (check the latest version here: https://cran.r-project.org/web/packages/xml2/index.html)

 R CMD INSTALL --configure-vars='INCLUDE_DIR=/usr/local/opt/libxml2/include/libxml2 LIB_DIR=/usr/local/opt/libxml2/lib/' ./xml2_1.2.5.tar.gz

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