http://divx.euro.ru seems to be gone. the newer ebuilds of avifile have changed that, but seemed to be still masked.
On the avifile site, is says "latest stable but OBSOLETE release. (and it doesn't compile on modern distribution - so DO NOT BOTHER with bugreporting - simply download and use latest avifile-0.6)" Azarah, since you are the media guru around here, maybe you know why the avifile 0.6'es are still masked?
I think agriffis added it for his own use, and because it is CVS snapshots, or alpha releases, he added it masked.
Removed old ebuilds.