sudo add-apt-repository ppa:linaro-maintainers/toolchain
sudo apt-get update
sudo apt-get install gcc-4.7
$ sudo apt-get install gcc-arm-linux-gnueabihf
$ sudo apt-get install g++-arm-linux-gnueabihf
$ sudo apt-get install gcc-arm-linux-gnueabi
cat >> ~/.bashrc <<EOF 혹은 nano 에디터 사용
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabi-