"I assume that you are running either Debian Squeeze (testing)
or Mandriva 2010.0 or a more recent version of these distributions.
For Mandriva 2010.0, you also need to have activated the Backports
repositories. You can activate them in the Mandriva Control Centre
– Software Management – Configure media sources.
"Using GTK+ applications in KDE
"If you want to use a unified look for KDE and GTK+
applications, then I recommend using the QtCurve theme. Just like
Mandriva's Ia Ora, it consists of a theme engine for KDE and
another one for GTK+ which looks exactly the same.
"In Mandriva you install the kde4-style-qtcurve package. If you
have urpmi's "suggests" support enabled (it is by default), then
this will automatically pull in both the KDE 4 and the GTK+ theme,
and also systemsettings-qt-gtk, a tool which lets you choose the
GTK+ theme to use in KDE.
"In Debian you need the packages qtcurve and also
system-config-gtk-kde to set up the GTK+ theme."