Hello, Lilypond transitioned to guile 2. Thus in core/internal/control.scm
(use-syntax (ice-9 syncase)) Will not be nescessary anymore and won’t work. We can replace it by (if (< (string->number (car (string-split (version) #\.))) 2) (use-syntax (ice-9 syncase))) which keeps compatibility to older Lilypond versions. In bezier/_internal/ special-cpts-display.ily the statements #(cond ((not (defined? 'debug-control-points-line-thickness)) 0.05))) &c. do not work anymore, one could fix this by doing #(define debug-control-points-line-thickness (if (not (defined? 'debug-control-points-line-thickness)) 0.05 debug-control-points-line-thickness)) Regards, Valentin
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