GTK themes in Qt applications

Qt Desktop applications need a little help to use your desktop theme in GNOME.

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

Set the gtkstyle USE flag. If there is a blocker, unset the qt4 flag in :

and rebuild the packages with their new USE flags:

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.

Caveats

 * 32bit applications on multilib systems are still unaware of the system's GTK+ theme, probably because is compiled without the gtkstyle USE flag enabled.

GTK+2 alternative
An alternative for users of GTK+2 and Qt4 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.