Mac

The ARM cross-compiler can be downloaded from:

http://www.carlson-minot.com/available-arm-gnu-linux-g-lite-builds-for-mac-os-x

After installing the program, you need to add the compiler path, this can be done using:
echo export PATH=/usr/local/carlson-minot/crosscompilers/bin/:$PATH >> ~/.bash_profile && . ~/.bash_profile

Mac users can refer to the Linux tutorials for further information.