FreeOrion is a free, open source, turn-based space empire and galactic conquest ( 4X ) computer game. The game isdesigned and built by the FreeOrion project,inspired by the tradition of the Master of Orion games. However, it’s not a clone or remake of that series or any other game. The project provides binary installers for windows and OS X, but linux users have to compile from source. The following instructions show how tocompile and install FreeOrion on Fedora.

FreeOrion: Prerequisites
To compile, first install the following prerequisites.
sudo dnf install cmake libvorbis-devel boost-devel zlib-static freetype-devel mesa-libGL-devel mesa-libGLU-devel SDL2-devel glew-devel openal-soft-devel sudo dnf groupinstall "C Development Tools and Libraries"Now download the source from GitHub.
git clone https://github.com/freeorion/freeorion.git FreeOrion: Build and installCreate a directory for the build.
mkdir freeorion_build cd freeorion_build/Now build FreeOrion.If you have a multi-core processor, you can add -j# to the make command. Substitute # withthe number of cores on your system as below. If you don’t know, it’s safe to leave this option off.
cmake ../freeorion make -j4 sudo make installYou can now find the game in your applications list. In GNOME Shell, hit the logo button, or move your mouse to the Activities hot corner to find it in the list:

The game has a built-in guide (‘Pedia) withvaluable instructions on how the game is played. Below you can also find agame play and tutorial video.
There are many more videos posted on YouTube. In addition, there is a quick start guide available on-line. Enjoy the game!