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    my %constructor= {
        MSWin32 => sub { FTP::Session::Win32->new( @_ ) },
...
    die "No constructor for $^O"   if  ! $ctor;
    my $session= $ctor->( ... );
    # Old Perl requires:  $session= &$ctor( ... );

    my %class= {
        MSWin32 => "FTP::Session::Win32",
...
    die "No constructor for $^O"   if  ! $ctor;
    my $session= $ctor->( $class{$^O}, ... );
    # Old Perl requires:  $session= &$ctor( $class{$^O}, ... );