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        return unless _can_write( MM->catfile( $CPAN::Config->{cpan_home}, 'sources' ) )
                  and _can_write( $Config::Config{sitelib} );
    }

    # if we're root, set UNINST=1 to avoid trouble unless user asked for it.
    my $makeflags = $CPAN::Config->{make_install_arg} || '';
    $CPAN::Config->{make_install_arg} =
      join( ' ', split( ' ', $makeflags ), 'UNINST=1' )
      if ( $makeflags !~ /\bUNINST\b/ and eval qq{ $> eq '0' } );

    # don't show start-up info
    $CPAN::Config->{inhibit_startup_message} = 1;

    # set additional options
    while ( my ( $opt, $arg ) = splice( @config, 0, 2 ) ) {
        ( $args{$opt} = $arg, next )
          if $opt =~ /^force$/;    # pseudo-option
        $CPAN::Config->{$opt} = $arg;
    }

    local $CPAN::Config->{prerequisites_policy} = 'follow';