I've changed /etc/portaga/package.use USE flags for wxpython to include "unicode", and when I thied an
emerge -vD --newuse wxpython
during compilation, it complained about the need to do the same thing to wxGTK, i.e., change the USE flags.
/etc/portage/package.use is for specifying USE-flags on a per package or even
per version level. If you add "dev-python/wxpython unicode" to this file,
portage will only turn the USE flag on for this particular package. It doesn't
know about the fact that x11-libs/wxGTK also needs to be built with
USE="unicode" support. You need to add the line "x11-libs/wxGTK unicode" to
package.use or add unicode to USE in make.conf or wait until portage has support
for USE depends.
*** This bug has been marked as a duplicate of 2272 ***