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are part of core-perl and you don't want a new package.
Some because they won't build on your system. Some because
your package manager of choice already packages them for you.

There may be a myriad of reasons. You can use the C<--ignore>
and C<--ban> options for this, but we provide some built-in
lists that catch common cases. You can use these built-in lists
if you like, or supply your own if need be.

=head2 Built-In Ignore List

=pod

You can use this list of regexes to ignore modules matching
to be listed as prerequisites of a package. Particularly useful
if they are bundled with core-perl anyway and they have known
issues building.

Toggle it by supplying the C<--default-ignorelist> option.

=cut

sub _default_ignore_list {

    my $list = << '=cut';
=pod

    ^IO$                    # Provided with core anyway
    ^Cwd$                   # Provided with core anyway
    ^File::Spec             # Provided with core anyway
    ^Config$                # Perl's own config, not shipped separately
    ^ExtUtils::MakeMaker$   # Shipped with perl, recent versions
                            # have bug 14721 (see rt.cpan.org)
    ^ExtUtils::Install$     # Part of of EU::MM, same reason

=cut

    return $list;
}

=head2 Built-In Ban list

You can use this list of regexes to disable building of these
modules altogether.

Toggle it by supplying the C<--default-banlist> option.

=cut

sub _default_ban_list {

    my $list = << '=cut';
=pod

    ^GD$                # Needs c libraries
    ^Berk.*DB           # DB packages require specific options & linking
    ^DBD::              # DBD drivers require database files/headers
    ^XML::              # XML modules usually require expat libraries
    Apache              # These usually require apache libraries
    SSL                 # These usually require SSL certificates & libs
    Image::Magick       # Needs ImageMagick C libraries
    Mail::ClamAV        # Needs ClamAV C Libraries
    ^Verilog            # Needs Verilog C Libraries
    ^Authen::PAM$       # Needs PAM C libraries & Headers

=cut

    return $list;
}

__END__

=head1 SEE ALSO

L<CPANPLUS::Dist>, L<CPANPLUS::Module>, L<CPANPLUS::Shell::Default>,
C<cpanp>

=head1 BUG REPORTS

Please report bugs or other issues to E<lt>bug-cpanplus@rt.cpan.org<gt>.

=head1 AUTHOR

This module by Jos Boumans E<lt>kane@cpan.orgE<gt>.

=head1 COPYRIGHT

The CPAN++ interface (of which this module is a part of) is copyright (c)
2001 - 2007, Jos Boumans E<lt>kane@cpan.orgE<gt>. All rights reserved.

This library is free software; you may redistribute and/or modify it
under the same terms as Perl itself.

=cut

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