LightZone in Gentoo betagarden 2013-02-17
sudo layman -a betagarden sudo emerge -av media-gfx/LightZone
What you get is LightZone 100% built from sources, no more shipped .jar files included.
One word of warning: the software has not seen much testing in this form, yet. So if your pictures mean a lot you, make backups before. Better safe than sorry.