We don't use wxWidgets 2.9 because we aren't fully compatible with it yet. Not sure why though.
About your issue, I tried this evening to install a Debian Sid. It didn't work, the "aptitude full-upgrade" just failed. So, I cannot check. Your issue could happen because of a new gcc version, ar new headers, or something else. Would be weird, Fedora being pretty much in advance on those things.