The libogc folder that is in the zip at https://sourceforge.net/projects/usbloadergx/files/Libraries/ was missing libwiidrc.a so it wouldn't compile.
I am really new to this and that got me stuck for quite a while. But once I figured out what was going on, I just added it from another folder I had on my computer and I was able to compile and go.
Thanks!
Thanks, I had the same issue.