Heh, I think I figured it out. This morning, when I went to do what you asked, I couldn't open my wxwidgets projects because it kept asking me to define "wx" for the currently active set. I had previously set up "wx" under a set I created named "wxwidgets", because I didn't want the wx variable when I was doing other things. (Is that even an issue, or can I just leave it in the default set). So I guess that even though I selected the "wxwidgets" set it wasn't active. I defined wx in the default set and it opened and compiled just fine.
So now I have to go wiki hunt for setting active sets. Thanks anyway.