audacious, calibre, not obeying Qt6 theme setting [SOLVED]

[ExecutorElassus]

I'm using qt6ct to set my Qt6 theme engine to use Kvantum, which has a nice flat SVG-based style that comes at least mostly close to the flat Gtk-3 style I've been using for over a decade. However, calibre and audacious (when the latter is set to use the Qt interface) don't seem to be using this theme, instead reverting to some default theme that looks vaguely like whatever KDE's default is, or the Qt5 default theme. I'm not using KDE, but rather FVWM, so I don't have access to any theme manager besides qt6ct and kvantummanager.

I thought qt5 was completely purged from my system, so why are these two apps using a theme that seems to derive from it? calibre and audacious seem like they both depend on Qt6, right?

Thanks for the help,

EE

[fedeliallalinea]

It seems that Calibre does not use the theme set in the system by default.

Environment variables
...
CALIBRE_USE_SYSTEM_THEME - by default, on Linux, calibre uses its own builtin Qt style. This is to avoid crashes and hangs caused by incompatibilities between the version of Qt calibre is built against and the system Qt. The downside is that calibre may not follow the system look and feel. If you set this environment variable on Linux, it will cause calibre to use the system theme – beware of crashes and hangs.
...

[ExecutorElassus]

yeesh, what a silly thing to do. I mean, I get it, distros sometimes use wildly obsolete or bleeding-edge engines. But packaging your own style seems … suboptimal.

Anyway, I added that variable to my .bashrc, and now it matches my other Qt apps.

I really wish there were a way to set everything to use one unified engine, but alas! I guess Gtk apps are going to continue looking like they did a decade ago and Qt apps will continue being hodge-podge. Thanks for the fix for calibre, though.

Cheers,

EE