Apache::Constants is a mod_perl 1 generation package. Apache 2 requires mod_perl 2. Check to make sure you have mod_perl 2 installed, and you might even want to remove mod_perl 1. It seems as somehow you have your apache2 installation attempting to use mod_perl 1.

In reply to Re: perl with apache 2.2.8 - referenced symbol not found - perl_require_module by redhotpenguin
in thread perl with apache 2.2.8 - referenced symbol not found - perl_require_module by switcharoonie

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