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only require Log::Log4perl::Config if it hasn't already been loaded
Mike, fwiw, Class::Load is not in core:
$ corelist Class::Load
Data for 2014-01-09
Class::Load was not in CORE (or so I think)
Good catch, Kevin! Lisa, I forgot to mention that Log4perl doesn't use external dependencies, so Class::Load isn't going to work, but I think you can examine %INC to see if a class has already been loaded.