Build Sonic Mania Ubuntu 20.04:
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Get Sonic Mania binary from: ~/.steam/steam/steamapps/common/Sonic Mania/Data.rsdk
and put it in the root of the Sonic Mania decompilation folder.


sudo apt install build-essential libglew-dev libglfw3-dev libtheora-dev zlib1g-dev libsdl2-dev
git clone --recursive https://github.com/Rubberduckycooly/Sonic-Mania-Decompilation
cd Sonic-Mania-Decompilation
cmake .
cmake --build .

The three binary needed will be here:
Sonic-Mania-Decompilation/Data.rsdk
Sonic-Mania-Decompilation/dependencies/RSDKv5/RSDKv5U
Sonic-Mania-Decompilation/dependencies/RSDKv5/libGame.so


Source: https://github.com/Rubberduckycooly/RSDKv5-Decompilation/blob/master/dependencies/ogl/README.md
Date: June 1st 2023