libgflags2 software package provides commandline flags module for C++ (shared library), 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 libgflags2
libgflags2 is installed in your system.
Make ensure the libgflags2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgflags2 *
You will get with libgflags2 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Libraries |
| Package | libgflags2 |
| Version | 2.0-2.1+b1 [s390x], 2.0-2.1 [a |
| Description | commandline flags module for C++ (shared library) |
| Sub Section | libs |