Summary says it all. This is after installing the current sys-auth/pam_ssh_agent_auth-0.10.3 (as of 02 November 2018) ebuild (not the 9999 version; that version fails to compile) with dev-libs/openssl-1.1.0j.
sudo: PAM unable to dlopen(/lib64/security/pam_ssh_agent_auth.so): /lib64/security/pam_ssh_agent_auth.so: undefined symbol: RSA_get0_p
After ssh-agent authorization fails, sudo prompts for the user's password.
I tried tracking down where RSA_get0_p is actually defined, but I am either too ignorant or too impatient to figure it out (maybe buried in a macro somewhere?)
Please let me know what other information you need to diagnose this.
pam_ssh-2.2 is out 5 hours ago
(In reply to Attila Tóth from comment #1)
> pam_ssh-2.2 is out 5 hours ago
that is a different package, right=
Per https://bugs.gentoo.org/669758 this bug too is resolved. I have verified it is working on a current Gentoo server with dev-libs/openssl-1.1.1d-r2.