disc-cover 1.5.5 has been released. Jano said me that it fixes latex problem so, it is highly recommended update the ebuild. Thanks
*** Bug 137291 has been marked as a duplicate of this bug. ***
*** Bug 137292 has been marked as a duplicate of this bug. ***
Now, disc-cover 1.5.6 has been released
1.5.6 is in the tree.