[CMake] Odd Behavior in macOS Mojave

[Steven Stallion]

All,

It appears there have been some changes to how macOS handles the
system include path starting with macOS Mojave. It looks like Apple
has provided a workaround package you can install to re-instate the
/usr/include hierarchy, however I was wondering if this is something
that could be handled by AppleClang support?

Has anyone else encountered this yet?

Cheers,
Steve