posixovl : A FUSE filesystem that provides POSIX functionality for filesystems that do not have such. ( http://sourceforge.net/projects/posixovl )
unionfs-fuse : Self-syncing tree-merging file system based on FUSE ( http://podgorny.cz/moin/UnionFsFuse )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a heroxbd
For Paludis use this rsync : rsync://gentoo.zugaina.org/heroxbd-portage
If you have a problem : ycarus(-at-)zugaina.org