Appendix D. Perlbrew, CPAN, and cpanm
Perl comes preinstalled on UNIX systems. Normally, you will find that the preinstalled version is older than the latest Perl release, and in some cases it will be subtly different. This Perl is designed by the system maintainers to work with the rest of the system. When you install packages, such as with the system package manager, the packages you install will have been tested against the version of Perl installed by the system.
Many of those packages are precompiled and tested versions of modules available on CPAN, the Comprehensive Perl Archive Network. This allows you ...
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