Hi!

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:
> Thank you. Unfortunately, the build fails later on with the following
> unrelated message, probably related to the latest Lilypond release:
>
>     fatal error: Uninitialized variable `write-performances-midis' in module (lily)
>

This is interesting, I can't reproduce this, it builds (and runs) fine here.
Are you using a newer version of lilypond? (here, its 2.20.0 from current master)

> Besides, you are adding this snippet to an unrelated phase, about Python
> wrapping.

Added a phase 'patch-readme: