Right click on the application and select Show Package Contents, and dig down into Contents/Resources/Java and you will find a libraries directory.
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Update: Also available on Github at https://github.com/arduino/Arduino/tree/master/libraries
Right click on the application and select Show Package Contents, and dig down into Contents/Resources/Java and you will find a libraries directory.
-br
Update: Also available on Github at https://github.com/arduino/Arduino/tree/master/libraries