Sometimes during the amp_upgrade, there is older/newer version of a rpm already installed on the AMP. This can cause the make/install to break. To remedy the situation, please follow these steps.
1. nano /root/svn/mercury/src/rpms/install_rpm
2. change options="--oldpackage"
3. root; make
package mod_auth_tacacs-1.0-6aw (which is newer than
mod_auth_tacacs-1.0-5aw) is already installed
make: *** [mod_auth_tacacs] Error 2