$ sudo apt-get update
$ sudo apt-get install libpocofoundation9 

libpocofoundation9 is installed in your system.

Make ensure the libpocofoundation9 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libpocofoundation9 *

You will get with libpocofoundation9 package name, version, architecture and description in a table

libpocofoundation9 package basic information: