在gentoo上装qt-assistant-4.6.2遇到了下面问题，请教下如何解决

zxxkevin

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gentoo ~ # emerge  --pretend "=qt-assistant-4.6.2"

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N     ] dev-util/automoc-0.9.88
[ebuild     U  ] x11-libs/qt-core-4.7.2-r2 [4.6.2-r1] USE="jit%* -private-headers%"
[ebuild     U  ] x11-libs/qt-dbus-4.7.2 [4.6.2]
[ebuild     U  ] x11-libs/qt-sql-4.7.2 [4.6.2] USE="-freetds%"
[ebuild     U  ] x11-libs/qt-script-4.7.2 [4.6.2] USE="jit%* -private-headers%"
[ebuild     U  ] x11-libs/qt-gui-4.7.2 [4.6.2] USE="-egl% -gtkstyle% -private-headers% -trace%"
[ebuild     U  ] x11-libs/qt-qt3support-4.7.2 [4.6.2]
[blocks b      ] <x11-libs/qt-qt3support-4.7.2 ("<x11-libs/qt-qt3support-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-script-4.7.2)
[ebuild  N     ] x11-libs/qt-test-4.7.2  USE="exceptions iconv (-aqua) -debug -pch"
[ebuild  N     ] x11-libs/qt-opengl-4.7.2  USE="exceptions qt3support (-aqua) -debug -egl -pch"
[ebuild  N     ] media-libs/phonon-4.5.0  USE="gstreamer (-aqua) -debug -pulseaudio -vlc -xine"
[ebuild  N     ] media-libs/phonon-gstreamer-4.5.0  USE="alsa -debug"
[ebuild  N     ] x11-libs/qt-webkit-4.6.2-r1  USE="dbus exceptions (-aqua) -debug -kde -pch"
[ebuild  N     ] x11-libs/qt-assistant-4.6.2  USE="exceptions (-aqua) -debug -pch"
[blocks B      ] <x11-libs/qt-webkit-4.7.2 ("<x11-libs/qt-webkit-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-script-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-qt3support-4.7.2)
[blocks B      ] <x11-libs/qt-core-4.7.2 ("<x11-libs/qt-core-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-script-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-qt3support-4.7.2)
[blocks B      ] <x11-libs/qt-dbus-4.7.2 ("<x11-libs/qt-dbus-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-script-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-qt3support-4.7.2)
[blocks B      ] >x11-libs/qt-test-4.6.2-r9999 (">x11-libs/qt-test-4.6.2-r9999" is blocking x11-libs/qt-webkit-4.6.2-r1, x11-libs/qt-gui-4.6.2, x11-libs/qt-xmlpatterns-4.6.2, x11-libs/qt-core-4.6.2-r1, x11-libs/qt-qt3support-4.6.2, x11-libs/qt-sql-4.6.2, x11-libs/qt-script-4.6.2, x11-libs/qt-dbus-4.6.2, x11-libs/qt-assistant-4.6.2)
[blocks B      ] >x11-libs/qt-script-4.6.2-r9999 (">x11-libs/qt-script-4.6.2-r9999" is blocking x11-libs/qt-webkit-4.6.2-r1, x11-libs/qt-gui-4.6.2, x11-libs/qt-xmlpatterns-4.6.2, x11-libs/qt-core-4.6.2-r1, x11-libs/qt-qt3support-4.6.2, x11-libs/qt-sql-4.6.2, x11-libs/qt-dbus-4.6.2, x11-libs/qt-assistant-4.6.2)
[blocks B      ] >x11-libs/qt-qt3support-4.6.2-r9999 (">x11-libs/qt-qt3support-4.6.2-r9999" is blocking x11-libs/qt-webkit-4.6.2-r1, x11-libs/qt-gui-4.6.2, x11-libs/qt-xmlpatterns-4.6.2, x11-libs/qt-core-4.6.2-r1, x11-libs/qt-sql-4.6.2, x11-libs/qt-script-4.6.2, x11-libs/qt-dbus-4.6.2, x11-libs/qt-assistant-4.6.2)
[blocks B      ] <x11-libs/qt-xmlpatterns-4.7.2 ("<x11-libs/qt-xmlpatterns-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-script-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-qt3support-4.7.2)
[blocks B      ] <x11-libs/qt-gui-4.7.2 ("<x11-libs/qt-gui-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-script-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-qt3support-4.7.2)
[blocks B      ] <x11-libs/qt-assistant-4.7.2 ("<x11-libs/qt-assistant-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-script-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-qt3support-4.7.2)
[blocks B      ] >x11-libs/qt-opengl-4.6.2-r9999 (">x11-libs/qt-opengl-4.6.2-r9999" is blocking x11-libs/qt-webkit-4.6.2-r1, x11-libs/qt-gui-4.6.2, x11-libs/qt-xmlpatterns-4.6.2, x11-libs/qt-core-4.6.2-r1, x11-libs/qt-qt3support-4.6.2, x11-libs/qt-sql-4.6.2, x11-libs/qt-script-4.6.2, x11-libs/qt-dbus-4.6.2, x11-libs/qt-assistant-4.6.2)
[blocks B      ] <x11-libs/qt-sql-4.7.2 ("<x11-libs/qt-sql-4.7.2" is blocking x11-libs/qt-test-4.7.2, x11-libs/qt-script-4.7.2, x11-libs/qt-opengl-4.7.2, x11-libs/qt-qt3support-4.7.2)
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我在emerge  --pretend "=qt-assistant-4.6.2"之前：
1. 把qt4.7.2相关的包都删了。
2. 通过下面的命令更新了系统:
   # emerge --update --deep --newuse world
   # emerge --depclean
   # revdep-rebuild