> On 21 Jun 2020, at 14:25, Hans Åberg <haber...@telia.com> wrote: > >> On 21 Jun 2020, at 11:45, Akim Demaille <a...@lrde.epita.fr> wrote: >> >> What locale are you using? > > LC_CTYPE=UTF-8
The error goes away if setting LC_CTYPE=en_US.UTF-8 before recompiling the .yy file. UTF-8 is language independent, so MacOS uses LC_CTYPE=UTF-8, but there are software that require a prefix.
