Thank you that worked out quite well. I had to make a few further changes, but it was nothing I couldn't figure out. I appreciate the help very much. I changed the gtk-win32-2.0 references to 3.0 references. I have tried deleting and reinstalling msys2 about 3 times, and each time I try to install GTK, it still doesn't download the complete file set, but I managed to find a different GTK3 download (not through msys2) that I still dont believe is complete, but it apparently has some of the missing files. The hello world sample still won't compile, but I believe that is just a problem of missing libraries that I'll have to try to find.
You, my friend, are a life saver.