Re: Is there an equivalent of #define ... #ifndef ... #endif in lilypond?

[Michael Hendry]

David Kastrup wrote:
> 
> 
> You can use
> 
> includeGuitar = ##t
> includeConcert = ##f
> includeTrumpet = ##t
> includeAlto = ##f
> 
> at the top and then do
> 
> $(if includeGuitar GuitarBook)
> $(if includeConcert ConcertBook)
> $(if includeTrumpet TrumpetBook)
> $(if includeAlto AltoBook)
> 
> at the bottom.
> 
> 

I'm beginning to think I'm terminally dim, but I can't get this to work, and
I can't find any reference to $(if...), (nor indeed to any kind of "if ...
then ... else") in the Lilypond manuals, despite several hours of hunting.

The error message I get is "syntax error, unexpected $undefined".
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