regression failures

I'm getting lots of regression failures:

======================== 25 of 89 tests failed.
========================

all pretty much looking like:
  SELECT '' AS one, o.* FROM OID_TBL o WHERE o.f1 = 1234;
! ERROR:  Relation "pg_constraint_contypid_index" does not exist  SELECT '' AS five, o.* FROM OID_TBL o WHERE o.f1 <>
'1234';

I guess a recent change requires an initdb but no change was forced?
(...an initdb does in fact fix the problem -- now only the "misc" test fails)

Joe