GDB version information not available

Hi,

I am working on porting the GNU Debugger for Xtensa Architectures. I 
tried porting GDB 7.5.91 and could compile it successfully.
When I try to run it however, I get:

shell> gdb --version
gdb: /lib/libz.so.1: no version information available (required by gdb)
GNU gdb (GDB) 7.5.91
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=i686-pc-linux-gnu --target=xtensa-elf".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.

Now, my system is Fedora 12 and my suspicion is that GDB compiles 
assuming a library version that is higher than what my system has. I 
wanted to know where inside the GDB source code could I get information 
about version information.

Thanks!
Tejas