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This attribute indicates that the user does not have to supply an argument for
the option. This is only valid if the arg-type is string
(see section Arg Type String) or keyword
(see section Arg Type Keyword). If it
is keyword
, then this attribute may also specify the default keyword to
assume when the argument is not supplied. If left empty, arg-default
(see section Default Option Argument Value) or the zero-valued keyword will be used.
This is overridden and the options are required if the libopts library
gets configured with --disable-optional-args
.
This document was generated by Bruce Korb on July 25, 2010 using texi2html 1.82.