These ebuilds come from https://github.com/funtoo/funtoo-overlay.
If you have some problems, go to the official site first.
lmdb : An ultra-fast, ultra-compact key-value embedded data store ( http://symas.com/mdb/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a funtoo-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/funtoo-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org