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

[misty at brew dot sh]

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

--- Comment #41 from Misty De Meo <misty at brew dot sh> ---
I requested a suggestion from Apple as to how to fix this, and was directed to
the developer technical support page:
https://developer.apple.com/support/technical/ Would you like me to file a
support request, or would a GCC developer like to do that?