I have been through the arduino forum and still can't find my answer.
I have 2 Macbooks.
1: An old Black Mackbook running Mac OS X Lion 10.7.5 (11G63)
2: A Macbook Pro running Mac OS X El Capitan 10.11.3 (15D21)
The problem I see with the old Macbook is
signal: illegal instruction
Error compiling for board Arduino/Genuino 101.
It happens on IDE 1.6.7, 1.6.8 and 1.6.9
I think that the Arduino 101 code has some how been made uncompilable on the older version of the Mac OS X.
I can not upgrade my old Macbook to a newer version of the OS.
Looking for some help.