When starting glightoff, it fails with the error
Could not find image file:
/usr/share/pixmaps/glightoff/bulb_on.svg
Please check GLightOff is installed correctly.
The missing file exists at the mentioned path. Turns out the problem is the
missing support for svg for GdkPixbuf. Without librsvg, the gdk-pixbuf image
loader for svg (/usr/lib/gtk-2.0/2.4.0/loaders/svg_loader.so on my system) is
missing, which means glightoff can't load its graphics because it uses
gdk_pixbuf_new_from_file for this. After emerging librsvg, the game starts.
So I think glightoff should rdepend on librsvg.
games-puzzle/glightoff-1.0.0
x11-libs/gtk+-2.8.12
gnome-base/librsvg-2.12.7