I just upgraded to Bitcoin 0.9.0 and I got this:
$ ./bitcoind
./bitcoind: /lib/libc.so.6: version `GLIBC_2.15' not found (required by
./bitcoind)
./bitcoind: /lib/libc.so.6: version `GLIBC_2.14' not found (required by
./bitcoind)
$ ./bitcoin-qt
./bitcoin-qt: /lib/libc.so.6: version `GLIBC_2.15' not found (required
by ./bitcoin-qt)
./bitcoin-qt: /lib/libc.so.6: version `GLIBC_2.14' not found (required
by ./bitcoin-qt)
Sniff.
Red Hat Enterprise Linux 6 uses glibc 2.12.