Recently I needed such a toolchain to test my RPi. However, crosstool-ng did not worked on OS X for me, so I had to figure it out myself and here is how I did it. Please perform these steps on a case-sensitive volume, otherwise it is not going to work. Prerequisites Alright then, open up Terminal.app and add your username to the wheel group sudo dseditgroup -o edit -a MYUSERNAME -t user wheel Rest