@ifopt and @ifnopt tags

This tag starts a new conditional group which must be ended by an @end if tag. The group will be ignored if the given configuration option is not equal to one of the specified values. If no value is specified, "1" is assumed.

@ifnopt tests with negated condition.

See also @else tag.

Syntax [link] 

@ifopt <option> [{<value> [| <value> | ...] }]
[ @else
... ]
@end if

Example [link] 

@ifnopt hide_internal
This document contains some library internal information intended
for developers.
@end if
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