Changes by: Jason J. Hickey (jyh at cs.caltech.edu)
Date: 2007-06-22 12:12:15 -0700 (Fri, 22 Jun 2007)
Revision: 11077
Log message:

      Fixed the problem with returning to the original
     directory in a .SUBDIRS export.  This was causing
     the problem with the cyclic .DEFAULT dependencies.