You either didn't install it successfully or simply copied a file to where you think it should be. If you want help show how you installed something and how it failed rather than repeat the fact that Perl can't find this module where it expects. cpan C::Scan from the command line to install this module and it's dependencies, or try using PPM. Again actaually read and understand How do I post a question effectively?

Update: Fixed typos

In reply to Re^5: Identifying functions in a c file and replacing with a keyword by marto
in thread Identifying functions in a c file and replacing with a keyword by ijalab

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