Hi,
I don't know exactly what is the problem, so I have a comment and a suggestion. First of all SLC 5.3 is already rather old. Could you update to the latests version of the SLC5 versions, since with this version the compilation works?
Since it looks like a problem with kerberos the easiest solution would be to switch of kerberos support in ROOT. This can be done by changing the rootconfig.sh file in the tools directory of your external packages installation. Edit the file and exchange the following line
by
--disable-globus --disable-krb5 \
After you have done this please run the configure.sh script again.
Ciao
Florian