DUE I2C speed

Hello all,

I am a long time user of the Arduino and Galileo, made a lot of things with the IDE and the libraries, but this time, I feel really stupid...

I am trying to find the wire.h to change the TWI_CLOCK settings, but I simply can't find it for the SAM on my Mac.

I have the Arduino IDE for the Galileo, and I can find it in the package (/Contents/Ressources/Java/hardware/arduino/sam/libraries/wire.h), but I can't find it in the Arduino 1.6 package.

And the crazy thing is that I can compile a sketch on my Due using this library, so it's somewhere, but where????

And I just installed 1.6.7 on a Windows machine : same thing, no /sam directory...

If any of you has an idea of what I am doing wrong...

Thanks

Benoit