Xubuntu: by default, Qt programs do not honor UI theme settings

[PowerUser]

Configuration:
 Default Xubuntu 11.10 64-bit desktop ISO image.

To reproduce:
1) Install clean Xubuntu 11.10 to HDD using defaults.
2) Make sure that GTK2 and GTK3 apps are using default theme in their UI.
3) Install some Qt-based program. For example, qutim. Any other Qt-based app which does not uses custom styles by default and relies on system defaults should do the trick as well.
4) Launch Qt-based program you've installed.
5) Make sure that Qt-based program ignores UI settings and uses some widgets set which looks different than default Xubuntu widgets.

Result:
 All Qt based apps will look poorly in Xubuntu. They will not look like native apps in this system.

Expected:
 Qt apps should obey system settings. At very least they should look properly with default theme.

Details:
 Some details on this issue and one of possible workarounds has been described on http://mikemcquaid.com/2011/12/make-qt-use-the-gtk-style-on-xfce-or-xubuntu/

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Daniel Letzeisen (dtl131)]

I usually work around it by installing the kde settings program (sudo apt-get install --no-install-recommends systemsettings) and tweaking appropriately.