bug#54382: 28.0.92; --with-x-toolkit=no leads to "FALLTHROUGH undefined" in Activate.c

[Po Lu]

Torsten Bronger <bronger@physik.rwth-aachen.de> writes:

> Since commit ec35e2621a9457, using --with-x-toolkit=no with
> "./configure" leads to:
>
> Activate.c: In function ‘XMenuActivate’:
> Activate.c:618:3: error: ‘FALLTHROUGH’ undeclared (first use in this function)
>   618 |   FALLTHROUGH;
>       |   ^~~~~~~~~~~

Thanks, I will look into this, right after I fix the Xt build bug with
non-specified positions.