https://bugs.winehq.org/show_bug.cgi?id=50625
--- Comment #22 from Zebediah Figura z.figura12@gmail.com --- FWIW, the configure script tries first to check for unw_step(), and then tries it again linking to UNWIND_LIBS (which defaults to -lunwind). You've quoted the first check, but both fail in the log, and I'm guessing it's the latter that's supposed to work.