IBus doesn't work on Qt programs

[Ooker]

I'm just a user, not developer. After installing IBus, it work well in Firefox but not in Qt programs like Kate, Konsole.

These lines are in my ~/.profile:
export GTK_IM_MODULE=ibus
export QT4_IM_MODULE=xim
export QT_IM_MODULE=xim
export XMODIFIERS=@im=ibus

My version of Qt:
ooker@ooker-Aspire-4741:~$ qmake -v
QMake version 3.0
Using Qt version 5.0.2 in /usr/lib/i386-linux-gnu

I use Netrunner, a KDE OS.

[Vincent007]

The version of Qt you used is old. Please try Qt 5.2.1 or Qt 5.3 RC which will be released very soon.

[Ooker]

Does upgrade Qt affect to KDE?

[Vincent007]

Depend on where you install Qt into. You should let your programs link with newer version of Qt.