To add 'mod_auth_dbm' to apache you will need to take the following steps:
Once the install has started then you will need to chose 'option 7' and once apache has been download then you can quit the update and proceed to the next step.
[~]# cd /home/cpapachebuild/buildapache/apache_1.3.37/src/modules/standard/
[~]# /usr/local/apache/bin/apxs -cia mod_auth_dbm.c
[~]# /etc/init.d/httpd restart
Now you can use the following command to make sure that the module has been loaded correctly:
[~]# cat /usr/local/apache/conf/httpd.conf | grep mod_auth_dbm
LoadModule dbm_auth_module libexec/mod_auth_dbm.so