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Not that I know of. The system theme is dependent on the desktop environment used. Every desktop environment has different ways of specifying the current icon theme. I assume Qt uses some heuristics to try to detect the system theme. I have no idea how and where those work.
IIRC KDE 4 sets a symlink called default.kde4 in /usr/share/icons
Dunno what all the other desktop environments do.
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