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For each option you wish to specify, you must have a block macro named
flag defined. It MUST contain at least two defined text
values named name and descrip. If any options do not have a
value macro, then the long-opts global text macro must 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.
There are four categories of option attributes. The fifth section below describes what data are available for writing option processing code.