}
    $self->{is_tested}{$what} = $when;
}

#-> sub CPAN::reset_tested
# forget all distributions tested -- resets what gets included in PERL5LIB
sub reset_tested {
    my ($self) = @_;
    $self->{is_tested} = {};
}

#-> sub CPAN::is_installed
# unsets the is_tested flag: as soon as the thing is installed, it is
# not needed in set_perl5lib anymore
sub is_installed {
    my($self,$what) = @_;
    delete $self->{is_tested}{$what};
}

sub _list_sorted_descending_is_tested {
    my($self) = @_;
    sort
        { ($self->{is_tested}{$b}||0) <=> ($self->{is_tested}{$a}||0) }
            keys %{$self->{is_tested}}
}

#-> sub CPAN::set_perl5lib
# Notes on max environment variable length:
#   - Win32 : XP or later, 8191; Win2000 or NT4, 2047
{
my $fh;
sub set_perl5lib {
    my($self,$for) = @_;
    unless ($for) {
        (undef,undef,undef,$for) = caller(1);
        $for =~ s/.*://;
    }
    $self->{is_tested} ||= {};
    return unless %{$self->{is_tested}};
    my $env = $ENV{PERL5LIB};
    $env = $ENV{PERLLIB} unless defined $env;
    my @env;
    push @env, split /\Q$Config::Config{path_sep}\E/, $env if defined $env and length $env;
    #my @dirs = map {("$_/blib/arch", "$_/blib/lib")} keys %{$self->{is_tested}};
    #$CPAN::Frontend->myprint("Prepending @dirs to PERL5LIB.\n");

    my @dirs = map {("$_/blib/arch", "$_/blib/lib")} $self->_list_sorted_descending_is_tested;
    return if !@dirs;

    if (@dirs < 12) {
        $CPAN::Frontend->optprint('perl5lib', "Prepending @dirs to PERL5LIB for '$for'\n");
        $ENV{PERL5LIB} = join $Config::Config{path_sep}, @dirs, @env;
    } elsif (@dirs < 24 ) {
        my @d = map {my $cp = $_;
                     $cp =~ s/^\Q$CPAN::Config->{build_dir}\E/%BUILDDIR%/;
                     $cp
                 } @dirs;
        $CPAN::Frontend->optprint('perl5lib', "Prepending @d to PERL5LIB; ".
                                 "%BUILDDIR%=$CPAN::Config->{build_dir} ".
                                 "for '$for'\n"
                                );
        $ENV{PERL5LIB} = join $Config::Config{path_sep}, @dirs, @env;
    } else {
        my $cnt = keys %{$self->{is_tested}};
        $CPAN::Frontend->optprint('perl5lib', "Prepending blib/arch and blib/lib of ".
                                 "$cnt build dirs to PERL5LIB; ".
                                 "for '$for'\n"
                                );
        $ENV{PERL5LIB} = join $Config::Config{path_sep}, @dirs, @env;
    }
}}

package CPAN::CacheMgr;
use strict;

#-> sub CPAN::CacheMgr::as_string ;
sub as_string {
    eval { require Data::Dumper };
    if ($@) {
        return shift->SUPER::as_string;
    } else {
        return Data::Dumper::Dumper(shift);
    }
}

#-> sub CPAN::CacheMgr::cachesize ;
sub cachesize {
    shift->{DU};
}

#-> sub CPAN::CacheMgr::tidyup ;
sub tidyup {
  my($self) = @_;
  return unless $CPAN::META->{LOCK};
  return unless -d $self->{ID};
  my @toremove = grep { $self->{SIZE}{$_}==0 } @{$self->{FIFO}};
  for my $current (0..$#toremove) {
    my $toremove = $toremove[$current];
    $CPAN::Frontend->myprint(sprintf(
                                     "DEL(%d/%d): %s \n",