You could dump %INC at the end of your script. It will contain all used and required modules. But of course, this will only be helpful if you don't require modules conditionally (require Foo if $bar).
Check out Module::ScanDeps and the "scandeps.pl" utility that comes with it. It can do a static (and recursive) analysis of your code for dependencies as well as the %INC dump either after compiling or running the program.
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