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RE: PNG file output

From: jschlomann
Subject: RE: PNG file output
Date: Thu, 2 Mar 2023 08:29:12 -0600

Yes "unbound error"-- Unbound variable: system*


The error I get with (system …) is

Unsupported SCM value for format: #t


I will try the script approach. I’m fairly confident I can get it to work. I just wondered if there was something simple in Scheme I was missing.


Thanks for the help, Jean.



From: Jean Abou Samra <>
Sent: Thursday, March 2, 2023 8:16 AM
Subject: Re: PNG file output


Le jeudi 02 mars 2023 à 08:11 -0600, a écrit :

I’ve found your response, and I’ve updated my list subscription to my new email.
My reason for wanting this is that I need to generate several types of output based on some other settings in my input file. For example, I need PDF output for print, and PNG output in a couple different resolutions for projection on a screen. This is for use in a church.
One thought I had was to spawn another LilyPond so that I could specify command line options based on the settings in my input file. I haven’t been able to get this to work so far, for reasons I don’t understand. I tried this using (system "lilypond -fpng"). I also tried Guile’s system*, but got an unbind error. I’m using 2.22.2.

Did you mean “unbound error”? But what is the error precisely?

Perhaps a better approach would be to define whatever settings you have outside of the LilyPond file, in a script invoking LilyPond, add compilation flags based on them, and also pass them to LilyPond using the --evaluate option (

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