RK3328 编译build root报错 “you need to install ‘unbuffer‘，log saved on /home/../firefly-sdk/br.log

make: Leaving directory '/home/nicholas/Desktop/firefly-sdk-20200629/firefly-sdk/buildroot'
you need to install 'unbuffer' (from package expect or expect-dev)
log saved on /home/nicholas/Desktop/firefly-sdk-20200629/firefly-sdk/br.log
tail: cannot open '/home/nicholas/Desktop/firefly-sdk-20200629/firefly-sdk/br.log' for reading: No such file or directory
Command exited with non-zero status 1
you take 0:05.18 to build builroot
====Build buildroot failed!====
 

上面提示 you need to install 'unbuffer' 

命令行输入 

$unbuffer

提示 sudo  apt install expect

命令行输入 

 sudo  apt install expect

在编译即可解决