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

[Michael Hendry]

When I've finished a jazz chart, I'll want to produce separate parts for several transposing instruments, but while I'm working on the entry of the melody and chords in concert pitch I only need to produce one .pdf file.

Obviously, I can comment out the sections I don't want during data entry work, and remove the comments once the work is complete, but it would be handy to be able to use a C-like construct like this:


#DEFINE NotYet
...
#IFNDEF NotYet
\book {
	\bookOutputName "Chez Fernand (alto)"
	\new Score
<<
	\transpose f' d {\TheChords}
	\new Staff
	\repeat unfold 13 {
    	s1 \noBreak s1 \noBreak s1 \noBreak s1 \break }
	\transpose f' d {\TheHead}
>>
	\header {piece = "Alto Sax"}
}
#ENDIF

to suppress unwanted output for the Alto sax part (and those for the other transposing instruments), and comment out the #DEFINE NotYet when I'm happy with the data entry.

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