Apache::Registry automatically puts every script in its own namespace, something like Apache::ROOT$script_name. This is so to avoid name clashes in global variables and subroutines, because every Apache::Registry script is running in the same perl interpreter. Putting a "package main" on top of such a script would make the special namespace void and thus name clashes would be possible.

As a workaround, one could use "package my_distinct_script_name" instead of "package main".