[Bug other/90330] gcc 9.1.0 fails to install on macOS 10.14.4

[matthew.thompson at nasa dot gov]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90330

--- Comment #4 from Matt Thompson <matthew.thompson at nasa dot gov> ---
Also: I do have all the log files still, so if you'd like anything grep'ed in
there, let me know.