On Fri May 17 14:40:04 2024 Stuart Henderson wrote
> > After I succesfully applied your diff, I followed the instructions in
> > /usr/xenocara/README.  I got these errors just after starting:
> > [...] 
> > 
> > Do I need some special step?
>
> See "Cleaning in packages managed by autotools" in xenocara/README
>

OK, now is compiling.  Thank you Stuart!