The CMake is provided as an alternative to the manually-crafted Visual Studio solutions, but over time was expanded to support other platforms.
It leverages vcpkg for its dependencies, as a consequence only SDL2 is supported.
Note: DOSBox configuration options defaults have been set for this environment.
To install the required dependencies: vcpkg install zlib sdl2 libpng.
Both SDL versions are supported.
TODO
Thanks to https://github.com/mkoloberdin for the Linux patches.