make: aarch64-linux-gnu-gcc: Command not found

build Kernel出現：
make: aarch64-linux-gnu-gcc: Command not found
解決：
export PATH=$PATH:/tool/linaro-aarch64_linux-2014.09_843419-patched/bin/
linaro-aarch64_linux-2014.09_843419-patched/bin/ 是自己下載放置的工具鏈，配好即可