Current version of the ebuild (and probably older versions as well) checks for the USE flag being set in x11-libs/qt-4*. This failed for me in a parallel build (--jobs), as qt-qt3support was not yet done emerging. In addition, looking at the ebuild, the USE flag is only checked at all if x11-libs/qt-4* is installed, which is not necessarily the case with 4.4. Proper way, rather than checking for the USE flag in versions >=x11-libs/qt-4.4, would be to directly depend on the qt-qt3support package instead, I think. Current deps are qt-core and qt-gui only. Reproducible: Always
According to the wpa_supplicant's changelog, starting from v0.6.2 there's suppose to be a Qt4 version of wpa_gui which is now a native Qt4 application thus not requiring Qt3Support anymore. This however doesn't actually seems to be the case as my build fails. But merely renaming wpa_supplicant-0.6.4.ebuild to wpa_supplicant-0.6.7.ebuild fixed the problem. So I'm guessing they fixed a few things between those two releases.
Version 0.6.9 is in the tree, could you give it a go?
0.6.9 does indeed work without qt3support.
