BEGIN {

unless(grep /blib/, @INC) {

chdir 't' if -d 't';

@INC = '../lib';

}

}

use Config;

BEGIN {

if(-d "lib" && -f "TEST") {

if ($Config{'extensions'} !~ /\bIO\b/ && $^O ne 'VMS') {

print "1..0\n";

exit 0;

}

}

}

use IO::Handle;

print "1..6\n";

my $i = 1;

foreach (qw(SEEK_SET SEEK_CUR SEEK_END _IOFBF _IOLBF _IONBF)) {

my $d1 = defined(&{"IO::Handle::" . $_}) ? 1 : 0;

my $v1 = $d1 ? &{"IO::Handle::" . $_}() : undef;

my $v2 = IO::Handle::constant($_);

my $d2 = defined($v2);

print "not "

if($d1 != $d2 || ($d1 && ($v1 != $v2)));

print "ok ",$i++,"\n";

}