Changes by: Jason Hickey (jyh at cs.caltech.edu)
Date: 2006-07-04 12:44:43 -0700 (Tue, 04 Jul 2006)
Revision: 9416
Log message:

      Added the standard syntax
      
         $(X:suf1=suf2)
      
      which means
      
         $(replacesuffixes suf1, suf2, $X)
      
      Also, fixed the errored output so that we will actually see
      what happens when an error occurs:/