I'm following this guide on github. I'm stuck at the command "cmake -GNinja -DCMAKE_BUILD_TYPE=Release ." which to my understanding does stuff like finding dependencies and setting up flags, though I don't know anymore about it than looking at it will tell me. This is where I'm getting the error I'm stuck on "CMAKE_CXX_COMPILER-NOTFOUND".

This is the output where the issue is: https://paste.ubuntu.com/p/3N3BYrrcMV/
Here is the error log in "/home/james/build/rigs-of-rods/CMakeFiles/CMakeError.log": https://paste.ubuntu.com/p/Kq9pjfBQbJ/

I've installed and groupinstalled about every build tool I can find, all from the Fedora 31 repos. I keep seeing that the issue is that gcc-c++ isn't installed from other forums, but it is installed on my system.

I'm exhausted from this whole adventure, which would double the length of this page if I were to explain, I've been working on it for the whole evening and early night. I'm stumped, I just can't figure out how to solve this "CMAKE_CXX_COMPILER-NOTFOUND" error. I'm new to this whole compiling thing so I'm probably missing something obvious yall are cringing about.

Look at the dependencies & commands used in this PKGBUILD. Even if you don't use Arch linux, it might help you understand.

PS: Maybe the precompiled version here is good: http://files.rigsofrods.org/rigs-of-rods-linux-rc5.zip ?

Thankyou, I had no idea the precompiled version was a thing on Linux.

The basic problem is, I think, that Fedora doesn't install cmake by default, but you can install it from the Fedora repository.

It's not very clear whether the zip file is for the Linux or Windows version.

It's a very nice game/simulator. Evolved, reasonably stable, lots of community content available.