$ sudo apt-get update
$ sudo apt-get install libpolkit-backend-1-dev 

libpolkit-backend-1-dev is installed in your system.

Make ensure the libpolkit-backend-1-dev package were installed using the commands given below,

$ sudo dpkg-query -l | grep libpolkit-backend-1-dev *

You will get with libpolkit-backend-1-dev package name, version, architecture and description in a table

libpolkit-backend-1-dev package basic information: