I can not compile the file compile-ffmpeg.sh about ijkplayer HOT 3 CLOSED

# try to detect NDK version
FF_NDK_REL=$(grep -o '^r[0-9]*.*' $ANDROID_NDK/RELEASE.TXT 2>/dev/null|cut -b2-)
case "$FF_NDK_REL" in
    9?*)
        # we don't use 4.4.3 because it doesn't handle threads correctly.
        if test -d ${ANDROID_NDK}/toolchains/arm-linux-androideabi-4.8
        # if gcc 4.8 is present, it's there for all the archs (x86, mips, arm)
        then
            echo "NDKr$FF_NDK_REL detected"
        else
            echo "You need the NDKr9 or later"
            exit 1
        fi
    ;;
    7|8|*)
        echo "You need the NDKr9 or later"
        exit 1
    ;;
esac