$ sudo apt-get update
$ sudo apt-get install libirstlm0 

libirstlm0 is installed in your system.

Make ensure the libirstlm0 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libirstlm0 *

You will get with libirstlm0 package name, version, architecture and description in a table

libirstlm0 package basic information: