libgcrypt : General purpose crypto library based on the code used in GnuPG ( http://www.gnupg.org/ )
mimetic : C++ MIME library designed to be easy to use and integrate, fast and efficient. ( http://www.codesink.org/mimetic_mime_library.html )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gentoo-clang
For Paludis use this rsync : rsync://gentoo.zugaina.org/gentoo-clang-portage
If you have a problem : ycarus(-at-)zugaina.org