$ sudo apt-get update
$ sudo apt-get install libatomic1-powerpc-cross 

libatomic1-powerpc-cross is installed in your system.

Make ensure the libatomic1-powerpc-cross package were installed using the commands given below,

$ sudo dpkg-query -l | grep libatomic1-powerpc-cross *

You will get with libatomic1-powerpc-cross package name, version, architecture and description in a table

libatomic1-powerpc-cross package basic information: