jihlein I was able to figure out that I needed to install ccache which isn't listed on the instructions, and that got me to where I was getting the gcsversioninfo.h error. I also noticed that the Qt install doesn't ask you for the install path like it used to, which is also different from what's listed in the instructions (seems the error I get is path-related, maybe I'm missing something at this point in the setup?).
I'm currently making a new folder with the stock dRonin repo, to see if it's something specific to your repo. My computer takes all day to download the Qt build tools, because Xfinity is the worst, so hopefully when I get home that'll be done and I can give it a shot (side note, would really like to figure out how to have multiple repos without having to build completely independent setups so I don't have to keep reinstalling Qt, but I digress).