The remaining items are optional.
-OpenSSH can utilise Pluggable Authentication Modules (PAM) if your system
-supports it. PAM is standard on Redhat and Debian Linux, Solaris and
-HP-UX 11.
+OpenSSH can utilise Pluggable Authentication Modules (PAM) if your
+system supports it. PAM is standard most Linux distributions, Solaris,
+HP-UX 11 and AIX >= 5.2.
NB. If you operating system supports /dev/random, you should configure
OpenSSL to use it. OpenSSH relies on OpenSSL's direct support of
/dev/random. If you don't you will have to rely on ssh-rand-helper, which
is inferior to a good kernel-based solution.
-PAM:
+Linux PAM:
http://www.kernel.org/pub/linux/libs/pam/
+OpenPAM:
+http://www.openpam.org/
+
If you wish to build the GNOME passphrase requester, you will need the GNOME
libraries and headers.