Tool for helping with deduplication of Perl code?

I'm looking for some tool/library that woul开发者_开发知识库d scan given project tree, and report on code duplicates - i.e. blocks of code that are repeated in various files.

Is there anything like this?

As it is now, I have to view them (files) all, and search for duplicates, but it doesn't strike me as very efficient.

A System for Detecting Software Plagiarism might work; it supports Perl.

And here's a list.