These ebuilds come from http://wiki.cregion.ru/moin.cgi/CRG_Overlay.
If you have some problems, go to the official site first.
glibc : GNU libc6 (also called glibc2) C library ( http://www.gnu.org/software/libc/libc.html )
libstdc++-v3 : Compatibility package for running binaries linked against a pre gcc 4.3.2 libstdc++ ( http://gcc.gnu.org/libstdc++/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a crg
For Paludis use this rsync : rsync://gentoo.zugaina.org/crg-portage
If you have a problem : ycarus(-at-)zugaina.org