##Building export CROSS_COMPILE=<path> (for ARM)
export SYSROOT=<path> (for ARM)
make

##Clean make clean

##Installing on Android adb push ./out/mkbootimg /data/local/tmp/
adb push ./out/unpackbootimg /data/local/tmp/
adb shell
chmod 0755 /data/local/tmp/mkbootimg
chmod 0755 /data/local/tmp/unpackbootimg
./data/local/tmp/mkbootimg
./data/local/tmp/unpackbootimg