lib64itm1 software package provides GNU Transactional Memory Library (64bit), you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install lib64itm1
lib64itm1 is installed in your system.
Make ensure the lib64itm1 package were installed using the commands given below,
$ sudo dpkg-query -l | grep lib64itm1 *
You will get with lib64itm1 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Libraries |
| Package | lib64itm1 |
| Version | 4.9.2-10 |
| Description | GNU Transactional Memory Library (64bit) |
| Sub Section | libs |