GTK themes in Qt applications

Setup
The GTK style for Qt can be built by setting the  USE flag for.

Set the  USE flag:

Now rebuild the package with its new USE flag:

Configuration
You might need to reselect the preferred theme for Qt applications using qtconfig (from ):

or just delete the previous configuration files:

Select the Default theme to use your system settings or set it to use the GTK style explicitly by selecting GTK theme.

Tips

 * Individual applications might have their own configuration settings for their GUI, e.g. in VLC this is located in Tools → Preferences.

GTK 2 alternative
An alternative for users of GTK 2 and Qt5 is using the QtCurve cross-toolkit theme:

The downsides of this method are that it's not available for GTK 3 yet, and currently the only configuration GUI needs Qt5 and KDE Frameworks 5.