libssm-dev software package provides macromolecular superposition library, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libssm-dev
libssm-dev is installed in your system.
Make ensure the libssm-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libssm-dev *
You will get with libssm-dev package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libssm-dev |
| Version | 1.1-0ubuntu1 |
| Description | macromolecular superposition library |
| Sub Section | libdevel |