emerge dev-python/PyQt and I didn't have sip installed. =dev-python/sip-3.0 is in the dev-python/PyQt ebuild file, but the emerge of PyQt did not first install sip.
It's probably related to this .... akira dev-python # emerge dev-python/PyQt Calculating dependencies. !!! Warning: couldn't find match for >=x11-libs/qt-3 in dev-python/PyQt-3.0 done! >>> emerge dev-python/PyQt-3.0 to /
PyQt 3.0 is now masked, as qt-3 is not ready for general consumption. Use PyQt-2.4 instead.