cmake software package provides cross-platform, open-source make system, 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 cmake
cmake is installed in your system.
Make ensure the cmake package were installed using the commands given below,
$ sudo dpkg-query -l | grep cmake *
You will get with cmake package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | cmake |
| Version | 3.6.2-2 |
| Description | cross-platform, open-source make system |
| Sub Section | devel |