Makefile: use libncurses instead of libncursesw on Darwin
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macOS 10.12.4 and many earlier versions have libncurses 5.4 with wide character support, but not libncursesw.
macOS system libcurses from ncurses 5.4 supports wide characters perfectly here.
Meanwhile, I am able to reproduce the issue on Debian Jessie with 2d7b575c8257fbc25f9959701ebebeb26f100036.
It is possible to use ncurses 6.0 from Homebrew instead, which does come with libncursesw, but I don't see the need, and it raises the bar of entry on macOS significantly. While I understand your reluctance, I'd say a uname test in the Makefile is the best compromise here.
> The really unexpected (and confusing) part is the No available formula with the name "bar" part.
I don't think that's new, and that's a separate issue.
This issue is about "unhelpful advice", and I was enlisted to discuss that, so I discussed just that.