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