deliver:  deliver e-mail to local users                           [recommended]
groff:    text formatting utilities.                                 [optional]
groff:    the groff package is used to "compile" man pages stored              
groff:    in groff/nroff format. These type of man pages would be              
groff:    found in /usr/man/man?. All the man pages in this system             
groff:    have been preprocessed and then GNU zipped and placed in             
groff:    the /usr/man/cat? directories. groff is *not* needed to              
groff:    use any of these included man pages.                                 
perl:     Larry Wall's interpreted systems language                  [optional]
binutils: C compiler utilities                                    [recommended]
clisp:    a Common Lisp interpreter                                  [optional]