Desc</tt>,
whose source files are in directory "<tt>MakeDesc</tt>".
This program will
dynamically build
a correct "<tt>mach_desc.h</tt>" for your platform (processor, compiler, 
run-time environment).
To get accurate results,
you must compile this program using the level of optimization 
(or higher) that you will use for NTL.
The program will print some diagnostics to the screen, 
and create the file "<tt>mach_desc.h</tt>" (in the current
directory, and not in the "<tt>include/NTL</tt>" directory,
where it 