[Users] Fixed: toolkit compiles on Mac OS X Catalina

Hi All,

Sorry for the "spam," but some of you may be interested in the solution. gcc 11.1.0_1 doesn't support range-based for statements, and consequently is rejected as a C++ compiler by the configure tool. On Catalina, brew won't upgrade 11.1 to a more recent version, so, since I don't care to try to build it from scratch, the best option is to reinstall gcc 10. brew install gcc@10 installs 10.3, which works (after the optionlist file is revised back to use gcc-10).

I don't know why the error with _ftiming was resolved by the change.

Yeesh. Now I can try to do something with the toolkit.

(Actually, it's still building and I may run into other errors, such as link errors, but I think I know how to fix those if they show up.)

Murray