编译busybox
一、yum install gcc gcc-c++ glibc glibc-devel pcre pcre-devel openssl openssl-devel systemd-devel zlib-devel glibc-static ncurses-devel lbzip2
二、wget https://busybox.net/downloads/busybox-1.30.1.tar.bz2
三、tar xf busybox-1.30.1.tar.bz2
四、cd busybox-1.30.1/
五、make menuconfig
按下面选择，把busybox编译也静态二进制、不用共享库 Busybox Settings –>Build Options –>[*] Build BusyBox as a static
六、make && make install 如果出错，执行make clean后，重新执行上面命令
七、mkdir /mnt/sysroot/
八、cp -a _install/* /mnt/sysroot/
