Comment 9 for bug 428642

I've fixed this issue by building agains libslab 2.30.0.

To fix this bug here this could be done:
1. Upgrade libslab0a from 2.27.91-3 to 2.30.0 (or add as a new pkg)
2. Add build depends to gnome-control-center for libslab-dev

Or backport the libslab fix to the libslab version included in gnome-control-center.

This is the fix for this issue:
http://git.gnome.org/browse/libslab/commit/?id=52f2fded15d8fc05a3f8463e25d5328b152a975b