libc6-amd64 software package provides GNU C Library: 64bit Shared libraries for AMD64, 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 libc6-amd64
libc6-amd64 is installed in your system.
Make ensure the libc6-amd64 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libc6-amd64 *
You will get with libc6-amd64 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Libraries |
| Package | libc6-amd64 |
| Version | 2.19-18+deb8u6 |
| Description | GNU C Library: 64bit Shared libraries for AMD64 |
| Sub Section | libs |