Postgres Alpha Port On RH6.0

This particular query from the regression test reltime.sql fails
also fails for >=
BUT not for < of <=

Where is the Comparison made, so I can trace backwards how it got there.

Any Hints would be appreaciated.
gat


QUERY: SELECT '' AS five, RELTIME_TBL.*
   WHERE RELTIME_TBL.f1 > '@ 3 seconds ago'::reltime;
five|f1
----+--
(0 rows)