SSH, glibc, and Red Hat

[Jason.C.Burns at wellsfargo.com]

Greetings all,
 
I have a quick question.  I'm building an rpm (ssh 4.2p1) for some RH-AS
machines and it's been working just fine.  However, I needed to install
it on an older box (AS 2.1), and received the following error:
 
starting /usr/sbin/sshd...

/usr/sbin/sshd: /lib/i686/libc.so.6: version `GLIBC_2.3' not found
(required by /usr/sbin/sshd)

/etc/init.d/wfssh: Error 1 starting /usr/sbin/sshd... bailing.

My only question is that is openssh dependant on libc >= 2.3, or is this
due to the version of libc on my build machine?  I couldn't find any
documentation on dependencies, so if that exists, if someone could point
me that way as well, I would most appreciate it.
 
Thanks!
 
Jason