electionguard-cpp VS electionguard-ui

I started off by trying to recreate the problem with another program I was working on, ElectionGuard, which was where I first encountered CPM. I set an empty environment variable for CPM_SOURCE_CACHE and tried building it, but I didn't get any errors related to CPM because I realized the MakeFile's definition of CPM_SOURCE_CACHE was overriding the one I set. I changed this to be empty and tried again, but it still built with no CPM issues.

Aside from Pataro, I've been poking at ElectionGuard and CPM.cmake as well. Both of them are pretty much at the same status, which is - built and ready to be worked on - but the logic of how to do so completely eludes me.

The first I worked on was ElectionGuard, which is an SDK that performs ballot encryption and verification functions for digital elections. I've been trying to build it for a few days now but had been unsuccessful so far. I started by installing GNU Make, Chocolatey, and MSYS2. I went through a lot of trial and error with CMake, including erroneously thinking my build worked when I searched for a .sln and found an included one that ended up being in C#. I eventually got Ninja as well which was listed as a requirement somewhere, and with all the tools in place I gave it another shot.

ElectionGuard I think compiles to a .dll? From what I can understand it's a SDK so I guess there are implementations with a UI but the C++ version isn't one of them? In any case I have the project built but can't compile in Visual Studio to actually see what's going on. So you can imagine working on it would be difficult.