help! emerge scim has gone wrong

1.emerge scim scim-pinyin

when it's emerging scim-qtimm ,it says:
You need to rebuild >=x11-libs/qt-3.3.4 with immqt-bc(recommended) or immqt USE flag enabled

2. and then,i execute the order :
" USE="immqt-bc" emerg =x11-libs/qt-3.3.4"

but it disappare:

emerge: there are no ebuilds to satisfy "=x11-libs/qt-3.3.4"

Now,I need helps, thanks a lot!

echo "x11-libs/qt immqt-bc" >> /etc/portage/package.use
emerge qt scim

不完全赞同楼上的做法：
echo "x11-libs/qt immqt-bc" >> /etc/portage/package.use
emerge -1N qt && emerge scim

还是不行，不过现在可以输入中文拉。以后用qt程序的时候注意下喽。等系统弄完后继续找答案