Configure Problem on x86_64 box

I am running CentOS 4 (RHEL 4) and am trying to install vqadmin 2.3.6.  
I receive the following errors.

./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
/downloads/qmailrocks/vqadmin-2.3.6/missing: Unknown `--run' option
Try `/downloads/qmailrocks/vqadmin-2.3.6/missing --help' for more 
information
configure: WARNING: `missing' script is too old or missing
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking build system type... Invalid configuration 
`x86_64-unknown-linuxoldld': machine `x86_64-unknown' not recognized
configure: error: /bin/sh ./config.sub x86_64-unknown-linuxoldld failed


This is an Athlon 64 CPU with the x86_64 version of CentOS (RHEL 4) 
installed.  I scanned the config.sub file and found that there is no 
reference to this arch within it.

Is there a patch out for this platform yet?

Thanks!
Loren