or there is a corner of stdio that is substandardised.
p4raw-id: //depot/perl@18481
print $tst "xxxx\n";
-if (tell($tst) == 15) { print "ok 27\n"; } else { print "not ok 27\n"; }
+if (tell($tst) == 15 ||
+ tell($tst) == 5) # unset PERLIO or PERLIO=stdio (e.g. HP-UX, Solaris)
+{ print "ok 27\n"; } else { print "not ok 27\n"; }
close($tst);