Change core lib location in Arduino IDE

Projects Libraries
3

Thank you for your reply, and it works using:

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micro9.name=Arduino 9bit
...
micro9.build.core=../../../../../../home/HOME/.arduino/core/9bit_serial/hardware/arduino/cores
micro9.build.variant=micro

But if in "micro9.build.core", i put "/home/HOME/.arduino/core/9bit_serial/hardware/arduino/cores", it just concatenates with "/us/share/arduino"
Is there a mean to enter a absolute path ?