Beta2 "horology" test failure on non-US zoneinfo/posixrules

Hello,

I'm building beta2 --with-system-tzdata, my /usr/share/zoneinfo/posixrules
is a symbolic link to localtime, which is Europe/London; the horology test
fails in three places:

--- expected/horology.out 2007-07-25 18:22:36.000000000 +0100
+++ results/horology.out 2007-11-10 21:15:50.325553844 +0000
@@ -605,7 +605,7 @@
SELECT timestamp with time zone '2005-04-02 12:00-07' + interval '1 day' as "Apr 3, 12:00";
Apr 3, 12:00
------------------------------
- Sun Apr 03 12:00:00 2005 CDT
+ Sun Apr 03 13:00:00 2005 CDT
(1 row)

SELECT timestamp with time zone '2005-04-02 12:00-07' + interval '24 hours' as "Apr 3, 13:00";
@@ -617,13 +617,13 @@
SELECT timestamp with time zone '2005-04-03 12:00-06' - interval '1 day' as "Apr 2, 12:00";
Apr 2, 12:00
------------------------------
- Sat Apr 02 12:00:00 2005 CST
+ Sat Apr 02 12:00:00 2005 CDT
(1 row)

SELECT timestamp with time zone '2005-04-03 12:00-06' - interval '24 hours' as "Apr 2, 11:00";
Apr 2, 11:00
------------------------------
- Sat Apr 02 11:00:00 2005 CST
+ Sat Apr 02 12:00:00 2005 CDT
(1 row)

RESET TIME ZONE;

If .../posixrules is a symlink to America/New_York (as originally in
tzdata) or does not exist at all, the test passes. Question: what is
broken here? Postgres, my setup, the concept behind posixrules...?

--
Radosław Zieliński <radek(at)pld-linux(dot)org>