These ebuilds come from http://code.google.com/p/gentoo-china-overlay.
If you have some problems, go to the official site first.
avast4workstation : avast! Linux Home Edition ( http://www.avast.com/eng/avast-for-linux-workstation.html )
bitdefender-scanner : Antivirus and antispyware scanner for both UNIX-based and Windows-based partitions ( http://www.bitdefender.com/PRODUCT-80-en--BitDefender-Antivirus-Scanner-for-Unices.html )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gentoo-china
For Paludis use this rsync : rsync://gentoo.zugaina.org/gentoo-china-portage
If you have a problem : ycarus(-at-)zugaina.org