gdnsd-dev software package provides authoritative domain name server (development files), you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gdnsd-dev
gdnsd-dev is installed in your system.
Make ensure the gdnsd-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep gdnsd-dev *
You will get with gdnsd-dev package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Library development |
| Package | gdnsd-dev |
| Version | 2.2.4-1 |
| Description | authoritative domain name server (development files) |
| Sub Section | libdevel |