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    $MAINT= !glob( "lib_$postfix[1]/$LIB_TREE/*" ) || 0;
    open( OUT, ">default" );
    print OUT $postfix[$MAINT];
    close OUT;
}

# extract override if there is one
my $type;
@ARGV=
  grep { defined $maint{$_} ? ( $type= $_, $MAINT= $maint{$_}, 0 ) : 1 } @ARGV;

# we have an override
if ($type) {
    print STDERR "Forcing to use the '$type' version of the code\n";
    open( OUT, ">default" );
    print OUT $postfix[$MAINT];
    close OUT;
}

# get default setting if necessary
else {
    open( IN, 'default' );
    $MAINT= $maint{ <IN> };
    close IN;
}

# sorry, we can't help you
if ( $auto_maint and !$MAINT ) {

    # can't do blead, autoselect active, so go to maint
    if ( $ENV{AUTO_SELECT_MAINT_OR_BLEAD} ) {
        $MAINT=1;
    }

    # alas, can't do blead
    else {
        $REQUIRED= sprintf '%1.6f', $REQUIRED;
        print STDERR <<"SORRY";

This distribution requires at least Perl $REQUIRED to be installed.  Since this
is an older distribution, with a history spanning almost a decade, it is also
available inside this distribution as a previous incarnation, which is actively
maintained as well.

You can install that version of this distribution by running this $0
with the additional "maint" parameter, like so:

 $^X $0 maint @ARGV

Or you can provide an automatic selection behavior, which would automatically
select and install the right version of this distribution for the version of
Perl provided, by setting the AUTO_SELECT_MAINT_OR_BLEAD environment variable
to a true value.  On Unix-like systems like so:

 AUTO_SELECT_MAINT_OR_BLEAD=1 $^X $0 @ARGV

Thank you for your attention.

SORRY

        my $line= (caller)[2];
        eval <<"BYEBYE" or print STDERR $@;
#line $line $0
require $REQUIRED;
BYEBYE
        exit 1;
    }
}

# create shortcuts
my $this= $postfix[$MAINT];
my $that= $postfix[ !$MAINT ];

# make sure empty directories exist, 'make dist' doesn't include them
foreach my $postfix (@postfix) {
    mkdir "lib_$postfix";
    mkdir "lib_$postfix/$_" foreach @lib_tree;
    mkdir "t_$postfix";
}

# need to move files into place
if ( my @files= glob( "lib_$this/$LIB_TREE/*" ) ) {
    print STDERR "Moving $this files into position\n";

    # move current files away
    mv_all( '', "_$that" );

    # put files into place
    mv_all( "_$this", '' );

    # make sure we will copy to blib
    unlink_all("blib/lib/$LIB_TREE/*");
}

# right files already there
else {
    print STDERR "Files for $this already in position\n";
}