@setfilename conditions
@set foo1
@clear foo2
@clear bar
@node Top
@top Test of conditions
@menu
@ifclear bar
@ifset foo1
* Foo1::		This text should be included.
@end ifset
@ifset foo2
* Foo2::		This text should not be included.
@end ifset
@end ifclear
* Foo3::		And we have no blank line here.
@end menu
@node Foo1
@chapter Foo1
@ifset foo2
@node Foo2
@chapter Foo2
@end ifset
@node Foo3
@chapter Foo3
@bye