net-misc/openssh does not support USE='${enabled_eol_flags%,}' anymore.
The Base system team *STRONGLY* recommends you not rely on this functionality,
since these USE flags required third-party patches that often trigger bugs
and are of questionable provenance.
If you must continue relying on this functionality, switch to
net-misc/openssh-contrib. You will have to remove net-misc/openssh from your
world file first: 'emerge --deselect net-misc/openssh'
In order to prevent loss of SSH remote login access, we will abort the build.
Whether you proceed with disabling the USE flags or switch to the -contrib
variant, when re-emerging you will have to set
  OPENSSH_EOL_USE_FLAGS_I_KNOW_WHAT_I_AM_DOING=yes
Sorry, but openssh no longer supports tcp-wrappers, and it seems like
you're trying to use it.  Update your ${EROOT}/etc/hosts.{allow,deny} please.
Running the full OpenSSH testsuite requires a usable shell for the 'portage'
user, so we will run a subset only.
The ebuild will now attempt to restart OpenSSH to avoid
bricking the running instance. See bug #709748.
The ebuild will now attempt to restart OpenSSH to avoid
bricking the running instance. See bug #709748.