Export your toolchain PATH e.g. /media/S9091/Linux/prebuilt/prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin:$PATH Build command: kernel ====== cd <kernel path> cp mediatek-configs out/.config TARGET_PRODUCT=tinnoes77_s9091 MTK_ROOT_CUSTOM=../mediatek/custom KBUILD_OUTPUT_SUPPORT=yes make O=out