CommonProblems

If you get an error: java.lang.unstatisfiedlinkerror no rxtxSerial

move the RXTXcomm.jar in java/jre/lib/ext and rxtxSerial.dll file to java/jre/lib

If you are on a mac and get:

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

run xcode-select --install

Solution source: http://stackoverflow.com/questions/32893412/command-line-tools-not-working-os-x-el-capitan