lib64quadmath0-dbg software package provides GCC Quad-Precision Math Library (64bit debug symbols), 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 lib64quadmath0-dbg
lib64quadmath0-dbg is installed in your system.
Make ensure the lib64quadmath0-dbg package were installed using the commands given below,
$ sudo dpkg-query -l | grep lib64quadmath0-dbg *
You will get with lib64quadmath0-dbg package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Debug packages |
| Package | lib64quadmath0-dbg |
| Version | 4.9.2-10 |
| Description | GCC Quad-Precision Math Library (64bit debug symbols) |
| Sub Section | Debug |