kdiff3-qt software package provides compares and merges 2 or 3 files or directories - Qt version, 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 kdiff3-qt
kdiff3-qt is installed in your system.
Make ensure the kdiff3-qt package were installed using the commands given below,
$ sudo dpkg-query -l | grep kdiff3-qt *
You will get with kdiff3-qt package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Development |
| Package | kdiff3-qt |
| Version | 0.9.98-1+b1 [s390x], 0.9.98-1 |
| Description | compares and merges 2 or 3 files or directories - Qt version |
| Sub Section | Devel |