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If you run /lib/libc.so.X (where x = 5 or 6 most likely) it'll tell you what verison it is.

Example:

Code:

j_shaw@lois ~ $ /lib/libc.so.6 

GNU C Library stable release version 2.3.5, by Roland McGrath et al.

Copyright (C) 2005 Free Software Foundation, Inc.

This is free software; see the source for copying conditions.

There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A

PARTICULAR PURPOSE.

Compiled by GNU CC version 3.3.5-20050130 (Gentoo 3.3.5.20050130-r1, ssp-3.3.5.20050130-1, pie-8.7.7.1).

Compiled on a Linux 2.6.11 system on 2005-08-25.

Available extensions:

        GNU libio by Per Bothner

        crypt add-on version 2.1 by Michael Glad and others

        linuxthreads-0.10 by Xavier Leroy

        The C stubs add-on version 2.1.2.

        GNU Libidn by Simon Josefsson

        BIND-8.2.3-T5B

        libthread_db work sponsored by Alpha Processor Inc

        NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk

Thread-local storage support included.

For bug reporting instructions, please see:

<http://www.gnu.org/software/libc/bugs.html>.