I’ve got it to at least link appropriately. Here’s what I did, not sure if using steam-run is all I needed to do, but I did all three of the following in this thread https://www.reddit.com/r/NixOS/comments/17kwkgv/switched_from_nobara_to_nixos_my_opinion_so_far/ Unreal Engine and Godot Engine nee...
you're welcome, if you're like me and also trying to make a C++ project without Visual Studio, this got me to build the blank C++ project without visual studio. For some reason, I had to run it twice to get everything compiled/built/cooked and for unreal editor to open the project.
I'm sure there's a lot of options in RunUAT I'm forgetting that VisualStudio is a wrapper for, but this and BuildProjectFiles.sh or whatever it's called seems to be the heavy lifters that visual studio leverages