This patch is not complete.  An additional discipline is needed to unlink
on close().

--- ./perlio.c-pre	Sat Sep 13 10:26:32 2003
+++ ./perlio.c	Sat Sep 20 00:07:48 2003
@@ -4861,7 +4861,7 @@ PerlIO_tmpfile(void)
      if (fd >= 0)
 	  f = PerlIO_fdopen(fd, "w+b");
 #else /* WIN32 */
-#    ifdef HAS_MKSTEMP
+#    if defined(HAS_MKSTEMP) && !defined(OS2)
      SV *sv = newSVpv("/tmp/PerlIO_XXXXXX", 0);
 
      /*
