Arash Esbati <arash@gnu.org> writes:

> I suspect it is due to change f9282e1d72[1].  My installed giflib
> version is 5.2.1 (with GCC 11.2).

Thanks.  Yes, that's the commit that caused this.

> Is this a Windows only issue?

Yes.  Could you please check if the attached patch fixes it?