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        ### if we don't have c::zlib, we'll need to use /bin/tar or we
        ### can not extract any files. Good time to change the default
        $Conf->{'conf'}->{'prefer_bin'} =
                                (eval {require Compress::Zlib; 1} ? 0 : 1 );

=item prefer_makefile

A boolean indicating whether or not prefer a C<Makefile.PL> over a
C<Build.PL> file if both are present. Defaults to 'true', unless
the perl version is at least 5.10.1 or appropriate versions of L<Module::Build>
and L<CPANPLUS::Dist::Build> are available.

=cut

        $Conf->{'conf'}->{'prefer_makefile'} =
            ( $] >= 5.010001 or
              ( check_install( module => 'Module::Build', version => '0.32' ) and
                check_install( module => INSTALLER_BUILD, version => '0.60' ) )
              ? 0 : 1 );

=item prereqs

A digit indicating what to do when a package you are installing has a
prerequisite. Options are:

    0   Do not install
    1   Install
    2   Ask
    3   Ignore  (dangerous, install will probably fail!)

The default is to ask.

=cut

        $Conf->{'conf'}->{'prereqs'} = PREREQ_ASK;

=item shell

A string holding the shell class you wish to start up when starting
C<CPANPLUS> in interactive mode.

Defaults to C<CPANPLUS::Shell::Default>, the default CPANPLUS shell.

=cut

        $Conf->{'conf'}->{'shell'} = 'CPANPLUS::Shell::Default';

=item show_startup_tip

A boolean indicating whether or not to show start up tips in the
interactive shell. Defaults to 'true'.

=cut

        $Conf->{'conf'}->{'show_startup_tip'} = 1;

=item signature

A boolean indicating whether or not check signatures if packages are
signed. Defaults to 'true' if you have C<gpg> or C<Crypt::OpenPGP>
installed, 'false' otherwise.

=cut

        $Conf->{'conf'}->{'signature'} = do {
            check_install( module => 'Module::Signature', version => '0.06' )
            and ( can_run('gpg') ||
                  check_install(module => 'Crypt::OpenPGP')
            );
        } ? 1 : 0;

=item skiptest

A boolean indicating whether or not to skip tests when installing modules.
Defaults to 'false'.

=cut

        $Conf->{'conf'}->{'skiptest'} = 0;

=item storable

A boolean indicating whether or not to use C<Storable> to write compiled
source file information to disk. This makes for faster startup and look
up times, but takes extra diskspace. Defaults to 'true' if you have
C<Storable> installed and 'false' if you don't.

=cut

       $Conf->{'conf'}->{'storable'} =
                        ( check_install( module => 'Storable' ) ? 1 : 0 );

=item timeout

Digit indicating the time before a fetch request times out (in seconds).
Defaults to 300.

=cut

        $Conf->{'conf'}->{'timeout'} = 300;

=item verbose

A boolean indicating whether or not C<CPANPLUS> runs in verbose mode.
Defaults to 'true' if you have the environment variable
C<PERL5_CPANPLUS_VERBOSE> set to true, 'false' otherwise.

It is recommended you run with verbose enabled, but it is disabled
for historical reasons.

=cut

        $Conf->{'conf'}->{'verbose'} = $ENV{PERL5_CPANPLUS_VERBOSE} || 0;

=item write_install_log

A boolean indicating whether or not to write install logs after installing
a module using the interactive shell. Defaults to 'true'.


=cut

        $Conf->{'conf'}->{'write_install_logs'} = 1;

=item source_engine

Class to use as the source engine, which is generally a subclass of