inconsistant regression test results...

I'm trying to build+install Postgresql 7.2.1 on a OpenBSD 3.1-stable
computer. The first time I built it, the 12/79 of the regression tests
failed. This scared me, so I did a gmake distclean and then reconfigured
and rebuilt everything. This time, 14/79 tests failed. It was getting
late (or rather, early, the sun was coming up), so I decided to put
things off until later.

This morning I got back to it. I redownloaded the src distribution, made
sure that its MP5 hash matched the expected, and then rebuilt
everything useing the following configure options:

./configure --prefix=/usr/local/encap/postgresql-7.2.1
--sysconfdir=/etc/postgresql --enable-multibyte --with-CXX
--with-openssl

This time, 11/79 test failed. This got me wondering, so I reran the
entire process (untaring, configuring, gmake'ing, and gmake check'ing)
three more times. Different results each time (14, 15, then 10). I have
saved the regression.out and regresson.diffs from each of these last
four tests.  You can seem them here:
http://vvk.brownforces.org/postgresql-regression/

I've read the doc's[1] and understand that some of the tests will
occasionally give different values, but I did not expect tests like
join, subselect, and arrays (and others) to give inconsistant results.
Is this expeceted?

-Vik

[1] specifically:
http://www.postgresql.org/idocs/index.php?regress-evaluation.html

--
Vikram Vinayak Kulkarni   Ultimately, all things are known because
vkulkarn@uiuc.edu         you want to believe you know.
vkulkarn@brownforces.org                            -Zensunni Koan