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For each option you wish to specify, you must have a block macro named
flag defined. There are two required attributes: name and
descrip. If any options do not have a value (traditional
flag character) attribute, then the long-opts global text macro
must also be defined. As a special exception, if no options have a
value and long-opts is not defined and
argument is not defined, then all arguments to the program are
named. In this case, the - and -- command line option
markers are optional.