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.

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