cervisia software package provides graphical CVS client, 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 cervisia
cervisia is installed in your system.
Make ensure the cervisia package were installed using the commands given below,
$ sudo dpkg-query -l | grep cervisia *
You will get with cervisia package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | cervisia |
| Version | 4:16.08.2-1 |
| Description | graphical CVS client |
| Sub Section | devel |