$ sudo apt-get update
$ sudo apt-get install libstfl-spl 

libstfl-spl is installed in your system.

Make ensure the libstfl-spl package were installed using the commands given below,

$ sudo dpkg-query -l | grep libstfl-spl *

You will get with libstfl-spl package name, version, architecture and description in a table

libstfl-spl package basic information: