Mismapping of Mountain Time

uname -a
Linux hemingway 2.6.32-25-server #44-Ubuntu SMP Fri Sep 17 21:13:39 UTC
2010 x86_64 GNU/Linux

date
Thu Mar  3 15:30:17 MST 2011

ls -l localtime
lrwxrwxrwx 1 root root 31 2010-10-18 08:20 localtime ->
/usr/share/zoneinfo/US/Mountain

postgres=# select * from pg_settings where name = 'TimeZone';
-[ RECORD 1 ]---------------------------------------------------------------
name       | TimeZone
setting    | Navajo
unit       |
category   | Client Connection Defaults / Locale and Formatting
short_desc | Sets the time zone for displaying and interpreting time stamps.
extra_desc |
context    | user
vartype    | string
source     | command line
min_val    |
max_val    |
enumvals   |
boot_val   | UNKNOWN
reset_val  | Navajo
sourcefile |
sourceline |

Version 8.4.7.

There is actually a time zone "Navajo", which is a *separate* time zone
from US/Mountain.  Ideas on how this happened?

-- 
                                  -- Josh Berkus
                                     PostgreSQL Experts Inc.
                                     http://www.pgexperts.com