gnome-flashback-herbstluftwm-session : Gnome Herbstluftwm session (via Gnome Flashback) ( https://wiki.gentoo.org/wiki/No_homepage )
herbstluftwm : A manual tiling window manager for X ( https://herbstluftwm.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a flow
For Paludis use this rsync : rsync://gentoo.zugaina.org/flow-portage
If you have a problem : ycarus(-at-)zugaina.org