OLL not working with lilypond 2.22

[Valentin Petzel]

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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