Problem with arduino due

[iamdperez]

First at all thanks for your contribution to the community.
Well, it seams to me that you made a wrong copy and past in this line. But even writing the correct cpu value I still having a problem detecting my arduino due. Fortunally, I fixed it changing this -> __AVR_ATSAMD21G18A__ for this -> __SAM3X8E__

ArduinoBoardManager/ArduinoBoardManager.h

Line 112 in 2b7be8a

static const uint16_t CPU = __AVR_ATSAMD21G18A__;