LibreSSL is already in Gentoo, but still requires a lot of ebuilds to be fixed. This overlay serves as a testing ground and makes testing easier by providing an openssl dummy ebuild, so you can compile packages against LibreSSL which don't have the 'libressl' USE flag yet.
Use eselect-repository
:
# eselect repository enable libressl
Now you can use emerge --sync
or emaint sync -r libressl
to sync this
repository.