Here's an example of the full error report that you might see:

Can't locate loadable object for module Apache::Util in @INC...

In this particular example, it means that there is no object built for Apache::Util. You should build mod_perl with one of these arguments: PERL_UTIL_API=1, EVERYTHING=1, or DYNAMIC=1.

For similar errors, see Chapter 3. Locate the missing module and see what build-time argument enables it.