QA Notice: USE Flag 'c++0x' not in IUSE for x11-libs/qt-webkit-4.8.3
I don't understand... the only usage is in qt4-build.eclass:
if use_if_iuse c++0x; then
use_if_iuse should not trigger the warning.
Can you attach a full build.log please?
This makes no sense and hasn't been reproducible by anyone. Closing as invalid.