Changes by: Aleksey Nogin (nogin at cs.caltech.edu)
Date: 2005-10-21 05:07:42 -0700 (Fri, 21 Oct 2005)
Revision: 7958
Log message:

      - Avoid repeating the include directories in both MP_INCLUDE environment
        variabele and the -I option to the filter (since the two are equivalent).
        
      - Hide the envoronment variable stuff, making the commandline that's presented
        to the user shorter.