I don't know if this is the case, but xfree.org lists yoper as one of the distributions using xfree, could you confirm this ?
see here
http://xfree86.org/distros/
If it is I can make sure I stay away from it.
If it doesn't use xfree anymore, could someone please contact some yoper person to get into contact with xfree.org (there's an email address on that page)
Cheers
Bareego