These ebuilds come from http://ohnopub.net/~ohnobinki/gentoo.
If you have some problems, go to the official site first.
boost-build : A system for large project software construction, which is simple to use and powerful. ( http://www.boost.org/doc/tools/build/index.html )
cmake : Cross platform Make ( http://www.cmake.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a ohnobinki
For Paludis use this rsync : rsync://gentoo.zugaina.org/ohnobinki-portage
If you have a problem : ycarus(-at-)zugaina.org