If i recall correctly Arduino IDE 1.5.8 is not supported by DigiX. however i did get it to work.
To get it to work i grabbed Digistump1.5Addons-v092.zip from
http://sourceforge.net/projects/digistump/files/Dropped the hardware folder in the Arduino folder.
I had to adjust the gcc in platform.txt under the sam folder to get the addons to play nice with 1.5.8:
compiler.path={runtime.ide.path}/hardware/tools/gcc-arm-none-eabi-4.8.3-2014q1/bin/
And Due RTC is not the right one as far as i know, the correct one (attached to my post) i dropped in the above sam folder under librarie's.
Do mind, i have no idea what i'm doing! I just know i fixed it like this.. Possible i broke some other stuff in the process
