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the non-core modules that the script might use are packed along inside the
script using fatpack (put inside a hash variable) or datapack (put in the DATA
section) technique. But XS modules cannot be packed using this technique. And
therefore, a module that requires non-core XS modules (either directly or
indirectly) also cannot be used.

So in other words, this routine checks that a module is PP (pure-perl) I<and> all
of its (direct and indirect) dependencies are PP or core.

To check whether a module is PP/XS, C<Module::XSOrPP> is used and this requires
that the module is installed because C<Module::XSOrPP> guesses by analyzing the
module's source code.

To list all direct and indirect dependencies of a module, C<lcpan> is used, so
that application must be installed and run first to download and index a local
CPAN/CPAN-like repository.

=head1 OPTIONS

C<*> marks required options.