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lib/Alien/Build/Manual/Contributing.pod  view on Meta::CPAN

to hard code the version and for the Alien developer and Alien consumer
developer to coordinate closely.

=head3 when installing a package the operating system as a whole should not be affected

The convenience of using an L<Alien> is that a user of a CPAN module
that consumes an L<Alien> doesn't need to know the exact incantation
to install the libraries on which it depends (or indeed it may not be
easily installed through the package manager anyway).

As a corollary, a user of a CPAN module that consumes an L<Alien>
module shouldn't expect operating system level packages to be
installed, or for these packages to be installed in common system
level directories, like C</usr/local> or C</opt>.  Instead a "share"
directory associated with the Perl install and L<Alien> module
should be used.

Plugins that require user opt-in could be written to prompt a user
to automatically install operating system packages, but this should
never be done by default or without consent by the user.