[Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797

--- Comment #6 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
(On both macOS 10.12 and 10.13, make is "GNU Make 3.81". But I have never seen
that bug on 10.12, and it's not been reported by any Homebrew user.)