Hello Dave, > On 24 Apr 2022, at 20:10, C. David Whiteman <davidwhiteman@xxxxxxx> wrote: > > Thinking of trying another solution (screenshot follows) > > <Screen Shot 2022-04-24 at 1.06.07 PM.png> > > Does this seem to you like something worth trying?? Not something I am familiar with, and it seems highly unlikely that strange work-arounds would be needed if everything is properly installed. The following occurs to me - on the basis that you have updated an existing Intel installation to an Arm64 / M1 one: NOTE: the Arm64 (M1) installation of homebrew is in a different place from the Intel one. (disclaimer; I’m not a homebrew dev) .. I would make sure that your PATH etc. are pointing to the Arm version (found in /opt/homebrew, I think) rather than the Intel install (which is usually in /usr/local) .. in case you copied across the Intel installation and/or configuration data. I really would recommend raising a ticket with homebrew (if you are 100% sure that everything is installed as it should be) - since there is every reason to expect that a properly installed compiler will “just work" (there is no issue raised with me about this, from the homebrew folks). thanks Iain