Description of Problem:

       PIPESTATUS
              An  array  variable (see Arrays below) containing a
              list of exit status values from  the  processes  in
              the   most-recently-executed   foreground  pipeline
              (which may contain only a single command).


How Reproducible:

[alane@wwweasel alane]$ false
[alane@wwweasel alane]$ echo $?
1
[alane@wwweasel alane]$ false|false
[alane@wwweasel alane]$ echo ${#PIPESTATUS[*]}
1
[alane@wwweasel alane]$ false|false
[alane@wwweasel alane]$ echo $PIPESTATUS
0
[alane@wwweasel alane]$ rpm -q bash
bash-2.05-8
[alane@wwweasel alane]$ set | grep BASH
BASH=/bin/bash
BASH_ENV=/home/alane/.bashrc
BASH_VERSINFO=([0]="2" [1]="05" [2]="8" [3]="1" [4]="release" 
[5]="i386-redhat-linux-gnu")
BASH_VERSION=$'2.05.8(1)-release'
[alane@wwweasel alane]$


Does this have to enabled by an option to configure when bash is built?

Additional Notes:

I would be very surprised if this problem does not exist in the release 
RPMS of bash as well, unless something obvious has changed very recently.