I copy wx-config to /usr/bin.
There should have already been a
wx-config there (the old one that comes with the system)
So you might want to keep your own version of it somewhere else, like in
/usr/local/bin ?
It's just a symbolic link, so it doesn't matter much if you've overwritten it...
But normally /usr and /System is reserved for software installed by Apple.
So, does the copying make it work ?