On Tue, Aug 03, 2021 at 11:51:16AM +0200, luigi scarso wrote:
> Patches applied, but I don't have variation.c, which is mentioned
> in luaharfbuzz.am.patch
> and  so variation.c.patch cannot be applied .
>

Sadly I introduced a bug here: Named instances queried from face
objects use 1-based indices, while the related Font method to set the
current instance still uses a zero based index.

I attached a patch to fix this issue.

Best regards,
Marcel