USE_AUSTRALIAN_RULES breaks regression tests in 7.1.2?

Hi all,

Am re-compiling and installing PostgreSQL 7.1.2 on a Mandrake 7.2 platform.  
I'm noticing defining the compiler variable "USE_AUSTRALIAN_RULES" is 
breaking the regression tests, specifically the horology and timestamp tests.

Just to check I'm doing it right, I'm defining the compiler variable by :

export CFLAGS='-mcpu=i686 -march=i686 -O2 -DUSE_AUSTRALIAN_RULES'
export CPPFLAGS='-mcpu=i686 -march=i686 -O2 -DUSE_AUSTRALIAN_RULES'
./configure --prefix=/opt/postgresql --enable-syslog

As a control test, doing the same thing but leaving out the 
-DUSE_AUSTRALIAN_RULES lets the regression tests pass fine.

Is this a known issue I've missed?  If's it's not I'll submit this to the 
"bugs" mailing list.

Regards and best wishes,

Justin Clift