otpclient : Simple GTK+ 3 OTP client (TOTP and HOTP) ( https://github.com/paolostivanin/OTPClient )
pam_u2f : Library for authenticating against PAM with a Yubikey ( https://github.com/Yubico/pam-u2f )
yubikey-touch-detector : A tool that can detect when your YubiKey is waiting for a touch ( https://github.com/maximbaz/yubikey-touch-detector )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a frabjous
For Paludis use this rsync : rsync://gentoo.zugaina.org/frabjous-portage
If you have a problem : ycarus(-at-)zugaina.org