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 uses glibc 2.12.