recent update causes postfix hang

[Tupshin Harper <tupshin@gmail.com>]

I updated my gcc-3.4 amd64 system today, which (among other things)
included an update to libc6: 2.3.2.ds1-20.0.0.1.gcc4.

After doing so, postfix hangs when receiving an SMTP connection.
Eventually the sender times out. Any ideas? Anybody else having such a
problem?

-Tupshin