AutoGen - The Automated Program Generator: 7.5.6.10 Option Argument Optional

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#### 7.5.6.10 Option Argument Optional

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`.

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