Install XML packages in MacOSX

In terminal, enter

brew install libxml2

Then enter these 3 lines:

export PKG_CONFIG_PATH="/usr/local/opt/libxml2/lib/pkgconfig"
export CPPFLAGS="-I/usr/local/opt/libxml2/include"
export LDFLAGS="-L/usr/local/opt/libxml2/lib"

You can put these lines in your .profile

Then 
R
install.packages("XML")




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