Kerberos on 64bit Linux with gcc 4.0

I was trying to compile kerberos on a 64 bit linux (CentOS). First I was getting configure errors about res_search(). Then I downloaded the latest and the greatest v5-1.5.1 from mit and tried to compile with gcc version 4.0. First the configure script was using the old compiler. So I need to teach it to use the gcc4. So I did...

export CC=gcc4
export CXX=g++4

After this configure script went fine. But the compilation was producing some errors like the following in the kadmin/test directory.

tcl_ovsec_kadm.c:85: `Tcl_HashEntry' undeclared (first use in this function)
tcl_ovsec_kadm.c:85: (Each undeclared identifier is reported only once
tcl_ovsec_kadm.c:85: for each function it appears in.)
tcl_ovsec_kadm.c:85: `entry' undeclared (first use in this function)
tcl_ovsec_kadm.c:93: warning: implicit declaration of function `Tcl_InitHashTable'
tcl_ovsec_kadm.c:93: `TCL_STRING_KEYS' undeclared (first use in this function)
tcl_ovsec_kadm.c:105: warning: implicit declaration of function`Tcl_CreateHashEntry'
tcl_ovsec_kadm.c:109: warning: implicit declaration of function `Tcl_SetHashValue'

Looks like I'm not alone -> http://mailman.mit.edu/pipermail/kerberos/2004-September/006391.html
So I followed it faitfully like this and everything went fine.

./configure --prefix=/home/test/krb5 --without-tcl