deltarpm software package provides Tools to create and apply deltarpms, 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 deltarpm
deltarpm is installed in your system.
Make ensure the deltarpm package were installed using the commands given below,
$ sudo dpkg-query -l | grep deltarpm *
You will get with deltarpm package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | deltarpm |
| Version | 3.6+dfsg-1+b2 [amd64, armel, a |
| Description | Tools to create and apply deltarpms |
| Sub Section | admin |