Downgrading Glibc Versions

[Browder, Tom]

I recently used yum to upgrade my glibc which went to version 2.4.
Unfortunately I need to maintain another system runnning FC 4 with no
glibc later than 2.3.

I am reluctant to tinker with glibc other than through credible rpms
because of its criticality for the whole system.

Is there any way to downgrade my FC 5 back to glibc 2.3 or upgrade my FC
4 to glibc 2.4 without a manual compilation of glibc or updating the FC
4 to FC 5?

Thanks.

-Tom