PPM is an alternative packaging manager, which was designed because most windows machines lake a compiler.

Most Linux systems, on the other hand come with a compiler, and can therefore compile the non-perl components of the Perl modules localy.

The easiest method of installing modules under Linux is to run the CPAN module, like this:

perl -MCPAN -e shell
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After some configuration questions, that should give you a prompt at which you can simply say

install Some::Module
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and it will install the desired module. It will even chase down the module dependencies, if you configure it that way.