These ebuilds come from https://github.com/l29ah/booboo.
If you have some problems, go to the official site first.
libev : A high-performance event loop/event model with lots of feature ( http://software.schmorp.de/pkg/libev.html )
librs232 : multiplatform library for serial communications over RS-232 (serial port) ( https://github.com/ynezz/librs232 )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a l29ah
For Paludis use this rsync : rsync://gentoo.zugaina.org/l29ah-portage
If you have a problem : ycarus(-at-)zugaina.org