Check symlinks. You should have:
/lib/libc.so.5 -> /lib/libc.so.5.4.17
/lib/libc.so -> /lib/libc.so.5
/usr/lib/libc.so.5 -> /lib/libc.so.5
I had same problem a while ago, guess either RH 3.0.3 had it wrong
with symlinks or libc-5.4.1x.bin.tar.gz misses the /usr/lib link...
or I simply blew something during upgrade :)
Cheers,
--alessandro <asuardi@uninetcom.it> <asuardi@it.oracle.com>
Linux kernel-2.1.20 libc-5.4.17 gcc-2.7.2.1 binutils-2.7.0.3