编译安装busybox

yum install gcc gcc-c++ glibc glibc-devel pcre pcre-devel openssl  openssl-devel systemd-devel zlib-devel glibc-static ncurses-devel 

wget https://busybox.net/downloads/busybox-1.30.1.tar.bz2

 tar xvf busybox-1.30.1.tar.bz2

 cd busybox-1.30.1/

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  binary (no shared libs) 

make && make install 如果出错，执行make clean后，重新执行上面命令 

mkdir /mnt/sysroot/ 

cp -a _install/* /mnt/sysroot/