firejail : a SUID security sandbox program that reduces the risk of security breaches by restricting the running environment of untrusted applications using Linux namespaces ( http://l3net.wordpress.com/projects/firejail/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a spike
For Paludis use this rsync : rsync://gentoo.zugaina.org/spike-portage
If you have a problem : ycarus(-at-)zugaina.org